{"title":"Yamaha Outboard 4-Stroke 25-40HP Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px 0;\"\u003e\n \u003cp\u003eThis page focuses on Yamaha 4-Stroke 25-40HP outboard engines. Use it to quickly find compatible parts and service information, including maintenance tips, commonly replaced items, and troubleshooting guidance. You can also browse our main Yamaha collection. Scroll to the bottom of this page to start browsing parts for this engine, and on the collection page use the Filter \u0026amp; Sort controls to narrow results by horsepower, year range, and part category.\u003c\/p\u003e\n \u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-outboard-parts\" style=\"display:inline-block;padding:10px 16px;border:1px solid #0a4a8a;border-radius:6px;text-decoration:none;color:#0a4a8a;\"\u003eBrowse All Yamaha Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:16px 0;\"\u003e\n \u003ch2\u003eHow to Identify Your 25-40HP Model\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003eNameplate location: Look for the model and serial plate on the transom\/clamp bracket (starboard side on most Yamaha models).\u003c\/li\u003e\n \u003cli\u003eReading the code: “F” indicates Four-Stroke; the number is horsepower (F25, F30, F40). Suffix letters often denote shaft length (S = 15\", L = 20\", X = 25\") and control type (R = remote, H = tiller). A final letter commonly indicates model year code.\u003c\/li\u003e\n \u003cli\u003eHigh-thrust variants: A leading “T” (e.g., T25) denotes High Thrust with a different gear ratio and larger propeller hub—important for prop and water pump parts.\u003c\/li\u003e\n \u003cli\u003ePlatform clues: F25 models are typically twin-cylinder; F30 and F40 are inline-3. Cowling decals and the serial tag confirm which platform you have.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"padding:16px 0;\"\u003e\n \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n \u003ch3\u003eF25 Platform (25 HP)\u003c\/h3\u003e\n \u003ctable style=\"width:100%;max-width:900px;border-collapse:collapse;\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eFeature\u003c\/th\u003e\n \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eDescription\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eConfiguration\u003c\/td\u003e\n \u003ctd\u003eTwin-cylinder EFI 4-stroke (lightweight midrange design)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eCommon Models\u003c\/td\u003e\n \u003ctd\u003eF25 (S\/L shaft options), T25 High Thrust variants\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eAdvantages\u003c\/td\u003e\n \u003ctd\u003eVery light package, smooth idle, excellent fuel economy for small craft and tenders\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eNotes\u003c\/td\u003e\n \u003ctd\u003eHigh Thrust (T25) uses a larger prop hub and different gear ratio; verify propeller and water pump kit compatibility by model code\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\n \u003ch3\u003eF30\/F40 Platform (30–40 HP)\u003c\/h3\u003e\n \u003ctable style=\"width:100%;max-width:900px;border-collapse:collapse;margin-top:12px;\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eFeature\u003c\/th\u003e\n \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eDescription\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eConfiguration\u003c\/td\u003e\n \u003ctd\u003eInline-3 EFI 4-stroke (shared architecture across 30\/40 HP)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eCommon Models\u003c\/td\u003e\n \u003ctd\u003eF30 and F40 with S\/L\/X shaft options; remote or tiller control variants\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eAdvantages\u003c\/td\u003e\n \u003ctd\u003eGood mid-range torque, quiet operation, reliable EFI starting\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eNotes\u003c\/td\u003e\n \u003ctd\u003eMany routine service items are shared between F30 and F40; confirm by serial\/model code for exact fit\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"service-kits\" style=\"padding:16px 0;\"\u003e\n \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n \u003cp\u003eIntervals below are general guidelines for Yamaha 4-stroke midrange models. Always follow the schedule and specifications in your official service manual.\u003c\/p\u003e\n \u003ctable style=\"width:100%;max-width:900px;border-collapse:collapse;\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eItem\u003c\/th\u003e\n \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eInterval*\u003c\/th\u003e\n \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eRemarks\u003c\/th\u003e\n \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eParts Link\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eEngine oil + filter\u003c\/td\u003e\n \u003ctd\u003eEvery 100 hours or annually\u003c\/td\u003e\n \u003ctd\u003eUse FC‑W 4-stroke marine oil; replace drain gasket; verify filter size by model\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-service-maintenance-kits\"\u003eYamaha Service \u0026amp; Maintenance Kits\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eGear oil (lower unit)\u003c\/td\u003e\n \u003ctd\u003eEvery 100 hours or annually\u003c\/td\u003e\n \u003ctd\u003eInspect for water intrusion (milky oil); replace crush washers\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-lower-unit-seal-kits\"\u003eYamaha Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSpark plugs\u003c\/td\u003e\n \u003ctd\u003eInspect 100 hours; replace 200–300 hours\u003c\/td\u003e\n \u003ctd\u003eGap to spec; replace if fouled or worn\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plugs\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eFuel filter (inline\/primary)\u003c\/td\u003e\n \u003ctd\u003eEvery 100 hours or annually\u003c\/td\u003e\n \u003ctd\u003eDrain water separators; replace clogged elements\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eWater pump impeller \/ kit\u003c\/td\u003e\n \u003ctd\u003eEvery 2 seasons or ~200 hours\u003c\/td\u003e\n \u003ctd\u003eShorten interval for sandy\/silty use or weak telltale stream\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-water-pump-repair-kits\"\u003eYamaha Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eAnodes (internal\/external)\u003c\/td\u003e\n \u003ctd\u003eInspect every 50 hours; replace when 50% wasted\u003c\/td\u003e\n \u003ctd\u003eSelect alloy for your water (aluminum for brackish\/salt, magnesium for fresh)\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-anodes\"\u003eYamaha Anodes\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003ePropeller \u0026amp; hub inspection\u003c\/td\u003e\n \u003ctd\u003eEvery 50 hours or after impact\u003c\/td\u003e\n \u003ctd\u003eCheck for nicks, bent blades, worn hub; remove to clear line on shaft\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-propellers\"\u003eYamaha Propellers\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"padding:16px 0;\"\u003e\n \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003eRoutine Service – \u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-service-maintenance-kits\"\u003eYamaha Service \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n \u003cli\u003eCooling System – \u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-water-pump-repair-kits\"\u003eYamaha Water Pump Repair Kits\u003c\/a\u003e\n\u003c\/li\u003e\n \u003cli\u003eFuel System – \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n \u003cli\u003eIgnition \/ Electrical – \u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\"\u003eElectrical Items\u003c\/a\u003e\n\u003c\/li\u003e\n \u003cli\u003ePropulsion – \u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-propellers\"\u003eYamaha Propellers\u003c\/a\u003e\n\u003c\/li\u003e\n \u003cli\u003eGearcase \u0026amp; Seals – \u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-lower-unit-seal-kits\"\u003eYamaha Lower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n \u003cli\u003eCorrosion Protection – \u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-anodes\"\u003eYamaha Anodes\u003c\/a\u003e\n\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:16px 0;\"\u003e\n \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n \u003ctable style=\"width:100%;max-width:900px;border-collapse:collapse;\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eSymptom\u003c\/th\u003e\n \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eCheck First\u003c\/th\u003e\n \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eRelated Parts\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eWeak telltale stream or overheat alarm\u003c\/td\u003e\n \u003ctd\u003eInspect intake screens, telltale hose, thermostat; verify impeller condition\u003c\/td\u003e\n \u003ctd\u003eWater pump kit, thermostat, intake screen, anodes\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eHard starting or rough idle\u003c\/td\u003e\n \u003ctd\u003ePrime bulb, check fuel quality, replace inline filter, inspect plugs and battery connections\u003c\/td\u003e\n \u003ctd\u003eFuel filter, spark plugs, injectors, battery cables\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n \u003ctd\u003eInspect prop for damage or wrong pitch, check for clogged filters, verify throttle\/linkage\u003c\/td\u003e\n \u003ctd\u003ePropeller, fuel filter, fuel pump, spark plugs\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n \u003ctd\u003eDrain gear oil and inspect; check prop shaft seals for fishing line; listen for bearing whine\u003c\/td\u003e\n \u003ctd\u003eLower unit seal kit, bearings, gear lube, crush washers\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eCharging issues (low or erratic voltage)\u003c\/td\u003e\n \u003ctd\u003eMeasure battery voltage, clean grounds, inspect regulator\/rectifier connections\u003c\/td\u003e\n \u003ctd\u003eRectifier\/regulator, stator, battery cables\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"faq\" style=\"padding:16px 0;\"\u003e\n \u003ch2\u003eFAQs\u003c\/h2\u003e\n \u003cdetails\u003e\n \u003csummary\u003eAre parts interchangeable between different years or platforms?\u003c\/summary\u003e\n \u003cp\u003eSome routine items overlap within the same platform (e.g., many F30\/F40 components). Always verify by full model code and serial number; High Thrust versions may use different props, gear ratios, and water pump components.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eWhen should I replace the water pump impeller?\u003c\/summary\u003e\n \u003cp\u003eTypically every 2 seasons or around 200 hours. Replace sooner if you run in sand\/silt, see a weak telltale stream, or after any overheat event.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eHow often should the lower unit gear oil be changed?\u003c\/summary\u003e\n \u003cp\u003eEvery 100 hours or annually, and immediately after any suspected prop strike or submersion. Check for milkiness (water) or metal flakes during each service.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n \u003cp\u003ePlease provide the full model code from the nameplate, serial number, shaft length (S\/L\/X), control type (tiller or remote), and the specific part or system you’re servicing.\u003c\/p\u003e\n \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px 0;\"\u003e\n \u003cp\u003eReady to find parts by horsepower, year, and model? Browse the main Yamaha collection to dial in the exact components for your engine.\u003c\/p\u003e\n \u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-outboard-parts\" style=\"display:inline-block;padding:10px 16px;border:1px solid #0a4a8a;border-radius:6px;text-decoration:none;color:#0a4a8a;\"\u003eBrowse All Yamaha Parts\u003c\/a\u003e\n \u003cp style=\"margin-top:8px;color:#555;\"\u003eIf you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"carburetor-repair-kit-fits-yamaha-mercury-mariner-25hp-40hp-4-stroke-outboards-replaces-65w-w0093-02-00-65w-w0093-01-00","title":"Carburetor Repair Seal Kit for Yamaha F25, T25, F30, F40 and F40B; Mercury\/Mariner 4-Stroke Outboards","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n table.ss-table th, table.ss-table td {\n padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n }\n table.ss-table th {\n white-space:nowrap;\n word-break:normal;\n letter-spacing:normal;\n font-weight:600;\n background:#f8fafc;\n }\n @media (max-width:480px){\n table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003ecarburetor repair seal kit\u003c\/strong\u003e is designed for selected Yamaha, Mercury and Mariner 4-stroke outboards. It is intended to help restore proper carburetor sealing and fuel-system operation when original gaskets, seals or related service components have become worn or damaged.\u003c\/p\u003e\n\u003cp\u003eThe company fitment records identify this kit for Yamaha Marine F25 and T25 models from 2004–2006, F30 models from 2000 onward, and F40\/F40B models from 2000 onward. The records also identify Mercury\/Mariner 4-stroke applications including 25 HP, 30 HP carbureted 3-cylinder, 40 HP carbureted 3- and 4-cylinder, and 50 HP and 60 HP 4-cylinder outboards.\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eCarburetor repair seal kit for selected marine outboard applications.\u003c\/li\u003e\n \u003cli\u003eAftermarket replacement for the listed OEM reference numbers.\u003c\/li\u003e\n \u003cli\u003eFitment depends on the exact engine model, configuration and serial-number range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eOEM Reference Numbers\u003c\/h2\u003e\n\u003cp\u003eUse the reference numbers below together with your engine model and carburetor configuration when checking compatibility. These numbers are reference identifiers only; they do not mean that every engine using one brand's part number is automatically compatible with every other application.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"OEM Reference Numbers\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand\u003c\/th\u003e\n \u003cth\u003eOEM Reference\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e65W-W0093-02\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e65W-W0093-01\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e67C-W0093-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n \u003ctd\u003e8542561\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm the full model designation, stroke type, carburetor configuration and serial-number range against your service manual before ordering. The following applications are the fitment descriptions provided for this product.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Yamaha Engine Compatibility\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand\u003c\/th\u003e\n \u003cth\u003eModel or Application\u003c\/th\u003e\n \u003cth\u003eRated HP\u003c\/th\u003e\n \u003cth\u003eStroke\u003c\/th\u003e\n \u003cth\u003eYears or Range\u003c\/th\u003e\n \u003cth\u003eOEM Reference\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF25\u003c\/td\u003e\n \u003ctd\u003e25\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2004–2006\u003c\/td\u003e\n \u003ctd\u003e65W-W0093-02, 65W-W0093-01, 67C-W0093-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eT25\u003c\/td\u003e\n \u003ctd\u003e25\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2004–2006\u003c\/td\u003e\n \u003ctd\u003e65W-W0093-02, 65W-W0093-01, 67C-W0093-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF30\u003c\/td\u003e\n \u003ctd\u003e30\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2000 onward\u003c\/td\u003e\n \u003ctd\u003e65W-W0093-02, 65W-W0093-01, 67C-W0093-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF40 \/ F40B\u003c\/td\u003e\n \u003ctd\u003e40\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2000 onward\u003c\/td\u003e\n \u003ctd\u003e65W-W0093-02, 65W-W0093-01, 67C-W0093-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Mercury and Mariner Engine Compatibility\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand\u003c\/th\u003e\n \u003cth\u003eApplication\u003c\/th\u003e\n \u003cth\u003eRated HP\u003c\/th\u003e\n \u003cth\u003eStroke\u003c\/th\u003e\n \u003cth\u003eConfiguration\u003c\/th\u003e\n \u003cth\u003eOEM Reference\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n \u003ctd\u003e4-stroke outboards\u003c\/td\u003e\n \u003ctd\u003e25\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003eApplication-specific; confirm model and serial range\u003c\/td\u003e\n \u003ctd\u003e8542561\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n \u003ctd\u003e30 HP carbureted\u003c\/td\u003e\n \u003ctd\u003e30\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e3-cylinder carbureted models\u003c\/td\u003e\n \u003ctd\u003e8542561\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n \u003ctd\u003e40 HP carbureted\u003c\/td\u003e\n \u003ctd\u003e40\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e3- or 4-cylinder carbureted models\u003c\/td\u003e\n \u003ctd\u003e8542561\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n \u003ctd\u003e4-cylinder outboards\u003c\/td\u003e\n \u003ctd\u003e50–60\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003eConfirm the exact carburetor application before ordering\u003c\/td\u003e\n \u003ctd\u003e8542561\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n \u003cdt\u003eProduct Type\u003c\/dt\u003e\n \u003cdd\u003eCarburetor repair seal kit\u003c\/dd\u003e\n \u003cdt\u003eApplication\u003c\/dt\u003e\n \u003cdd\u003eSelected Yamaha, Mercury and Mariner 4-stroke outboard carburetors\u003c\/dd\u003e\n \u003cdt\u003eReplacement Type\u003c\/dt\u003e\n \u003cdd\u003eAftermarket replacement\u003c\/dd\u003e\n \u003cdt\u003eInstallation\u003c\/dt\u003e\n \u003cdd\u003eService installation; exact procedure depends on the engine and carburetor model\u003c\/dd\u003e\n \u003cdt\u003eFuel System\u003c\/dt\u003e\n \u003cdd\u003eGasoline carburetor service application\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cp\u003eThe company catalog identifies this product as a carburetor repair seal kit but does not provide a verified component-by-component package list or quantities. Do not assume that the kit includes a complete carburetor, every internal carburetor component, or parts for multiple carburetors. Compare the supplied parts with the original components before installation.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n \u003cli\u003eUse the engine service manual to confirm the model, stroke type, carburetor configuration and serial-number range.\u003c\/li\u003e\n \u003cli\u003eDisconnect the battery and shut off or disconnect the fuel supply before beginning service.\u003c\/li\u003e\n \u003cli\u003eRemove the airbox or silencer and carburetor only as directed by the service manual.\u003c\/li\u003e\n \u003cli\u003eRecord the positions of fuel lines, linkages, hoses and adjustment components before disassembly.\u003c\/li\u003e\n \u003cli\u003eDisassemble the carburetor on a clean workbench and retain the original parts until the replacement parts have been matched.\u003c\/li\u003e\n \u003cli\u003eClean the carburetor body, jets and passages with an appropriate carburetor cleaner. Do not damage precision openings or sealing surfaces.\u003c\/li\u003e\n \u003cli\u003eInstall the new seals and gaskets in the correct locations. Do not reuse damaged or hardened sealing components.\u003c\/li\u003e\n \u003cli\u003eReassemble the carburetor and reinstall it with the correct tightening procedure from the service manual.\u003c\/li\u003e\n \u003cli\u003eSet float height, idle speed and any mixture adjustments only to the specifications for the exact engine model.\u003c\/li\u003e\n \u003cli\u003ePrime the fuel system, inspect for leaks and test the engine in a safe, well-ventilated area.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I confirm this kit fits my engine?\u003c\/summary\u003e\u003cp\u003eMatch your engine's brand, exact model, horsepower, 4-stroke designation, carburetor configuration and serial-number range with the fitment information above and your service manual. Also compare the carburetor's existing reference number with the listed OEM references.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhich Yamaha engines are listed for this kit?\u003c\/summary\u003e\u003cp\u003eThe company fitment records list Yamaha F25 and T25 models for 2004–2006, F30 models from 2000 onward, and F40\/F40B models from 2000 onward.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhich Mercury and Mariner engines are listed?\u003c\/summary\u003e\u003cp\u003eThe company fitment records list selected 4-stroke 25 HP engines, 30 HP carbureted 3-cylinder engines, 40 HP carbureted 3- and 4-cylinder engines, and 50 HP and 60 HP 4-cylinder engines. Exact model and serial-number verification is still required.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes one kit service every carburetor on a multi-carburetor engine?\u003c\/summary\u003e\u003cp\u003eThe company catalog does not specify the number of carburetors or a component quantity for this product. Check your engine's service manual and compare the required parts before ordering; additional kits may be required for multiple carburetors.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat symptoms may indicate worn carburetor seals?\u003c\/summary\u003e\u003cp\u003ePossible symptoms include hard starting, unstable idling, stalling, fuel leakage or poor acceleration. These symptoms can also result from clogged passages, incorrect adjustment, ignition faults or fuel-system problems, so diagnose the engine before replacing parts.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\u003cp\u003eNo. This is an aftermarket replacement seal kit intended for the applications and OEM reference numbers listed on this page. Yamaha, Mercury and Mariner are mentioned only to identify compatibility and reference numbers; this product is not manufactured by those companies.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003eVerify the exact engine model, year or serial range, stroke type and carburetor configuration before ordering.\u003c\/li\u003e\n \u003cli\u003eCompare the original parts and sealing surfaces with the replacement parts before installation.\u003c\/li\u003e\n \u003cli\u003eFuel-system service should be performed away from flames, sparks and other ignition sources.\u003c\/li\u003e\n \u003cli\u003eFollow the engine manufacturer's service procedures for disassembly, adjustment, leak checks and testing.\u003c\/li\u003e\n \u003cli\u003eDo not rely on horsepower alone to confirm compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — We provide aftermarket components for repair and maintenance of marine engines.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listings\u003c\/strong\u003e — Product pages include available model, configuration and reference-number information to support compatibility checks.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eCustomer Support\u003c\/strong\u003e — If your model or carburetor reference is not shown, contact support with the complete engine identification and original part information before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723798221115,"sku":"19CR009","price":25.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/19CR009-1.jpg?v=1763032058"},{"product_id":"timing-belt-fits-yamaha-f25-f40-replaces-65w-46241-00-00-57-57009-rec65w-46241-00","title":"Timing Belt for Yamaha F25–F40 and Mercury\/Mariner 4-Stroke Outboards","description":"\u003csection\u003e\n\u003cstyle\u003e\n .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n table.ss-table th, table.ss-table td { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n table.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n @media (max-width:480px){ table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; } }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003etiming belt\u003c\/strong\u003e is designed for selected Yamaha 4-stroke outboard motors and Mercury\/Mariner 4-stroke outboards. It is supplied as a single replacement belt for the engine timing system. Confirm the complete engine model, year, and applicable part number before ordering.\u003c\/p\u003e\n\u003cp\u003eFor Yamaha applications, this belt replaces Yamaha part number \u003cstrong\u003e65W-46241-00\u003c\/strong\u003e, also commonly shown in extended form as \u003cstrong\u003e65W-46241-00-00\u003c\/strong\u003e. For Mercury\/Mariner applications, the company fitment record lists OEM references \u003cstrong\u003e8M0151040\u003c\/strong\u003e, \u003cstrong\u003e8M0065179\u003c\/strong\u003e, \u003cstrong\u003e57-8M0151040\u003c\/strong\u003e, and \u003cstrong\u003e57-8M0065179\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eAftermarket replacement timing belt for specified marine outboard applications.\u003c\/li\u003e\n \u003cli\u003eSupports accurate synchronization of the engine timing system when correctly installed and tensioned.\u003c\/li\u003e\n \u003cli\u003eOne belt is included; this is not a kit and does not include pulleys, tensioners, covers, or other timing components.\u003c\/li\u003e\n \u003cli\u003eRecommended maintenance interval in the company record: inspect and replace according to the engine manufacturer's schedule, with a recommended maximum interval of 5 years or 100 hours of use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse the references below together with your original belt and engine identification information. Part-number appearance alone does not confirm fitment for every engine variant.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eEngine Brand\u003c\/th\u003e\n\u003cth\u003eOEM or Aftermarket Reference\u003c\/th\u003e\n\u003cth\u003eReference Type\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e65W-46241-00\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e65W-46241-00-00\u003c\/td\u003e\n\u003ctd\u003eExtended OEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e18-15135\u003c\/td\u003e\n\u003ctd\u003eAftermarket reference\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e8M0151040\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e8M0065179\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e57-8M0151040\u003c\/td\u003e\n\u003ctd\u003eOEM-style reference\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e57-8M0065179\u003c\/td\u003e\n\u003ctd\u003eOEM-style reference\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e18-15148\u003c\/td\u003e\n\u003ctd\u003eAftermarket reference\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe confirmed company fitment records cover the following applications. Keep the model, year, horsepower, stroke, and serial-number conditions together when checking compatibility.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Engine Model Compatibility\"\u003e\n \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel or Engine Group\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eYears or Conditions\u003c\/th\u003e\n\u003cth\u003eApplicable Reference\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF25\u003c\/td\u003e\n\u003ctd\u003e25 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1998–2005\u003c\/td\u003e\n\u003ctd\u003e65W-46241-00 \/ 65W-46241-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eT25\u003c\/td\u003e\n\u003ctd\u003e25 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2001–2005\u003c\/td\u003e\n\u003ctd\u003e65W-46241-00 \/ 65W-46241-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF30\u003c\/td\u003e\n\u003ctd\u003e30 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2001–2005\u003c\/td\u003e\n\u003ctd\u003e65W-46241-00 \/ 65W-46241-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF40\u003c\/td\u003e\n\u003ctd\u003e40 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2008\u003c\/td\u003e\n\u003ctd\u003e65W-46241-00 \/ 65W-46241-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e3-cylinder outboard engines\u003c\/td\u003e\n\u003ctd\u003e40 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003eAs specified by the engine manufacturer\u003c\/td\u003e\n\u003ctd\u003e8M0151040 \/ 8M0065179\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e40, 50, and 60 HP outboard engines\u003c\/td\u003e\n\u003ctd\u003e40–60 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003eAs specified by the engine manufacturer\u003c\/td\u003e\n\u003ctd\u003e8M0151040 \/ 8M0065179\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Mercury\/Mariner year and serial-number ranges are not stated in the company fitment record. Check the engine serial number and the original belt reference before installation.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n \u003cdt\u003eProduct Type\u003c\/dt\u003e\n \u003cdd\u003eTiming belt\u003c\/dd\u003e\n \u003cdt\u003eProduct Configuration\u003c\/dt\u003e\n \u003cdd\u003eSingle replacement belt\u003c\/dd\u003e\n \u003cdt\u003eApplication\u003c\/dt\u003e\n \u003cdd\u003eSelected Yamaha and Mercury\/Mariner 4-stroke outboard timing systems\u003c\/dd\u003e\n \u003cdt\u003eYamaha Application Reference\u003c\/dt\u003e\n \u003cdd\u003e65W-46241-00 \/ 65W-46241-00-00\u003c\/dd\u003e\n \u003cdt\u003eMercury\/Mariner Application References\u003c\/dt\u003e\n \u003cdd\u003e8M0151040, 8M0065179, 57-8M0151040, and 57-8M0065179\u003c\/dd\u003e\n \u003cdt\u003eAftermarket References\u003c\/dt\u003e\n \u003cdd\u003e18-15135 for Yamaha applications; 18-15148 for Mercury\/Mariner applications\u003c\/dd\u003e\n \u003cdt\u003eStroke\u003c\/dt\u003e\n \u003cdd\u003e4-stroke applications as listed above\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1 x\u003c\/span\u003e aftermarket timing belt\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNo pulleys, tensioners, fasteners, gaskets, tools, or installation hardware are included unless specifically stated by the seller.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n \u003cli\u003eDisconnect the battery and follow the safety procedures in the applicable engine service manual.\u003c\/li\u003e\n \u003cli\u003eRemove the engine cowling and covers required to access the timing-belt system.\u003c\/li\u003e\n \u003cli\u003eBefore removing the old belt, align the crankshaft and camshaft timing marks exactly as specified by the engine manufacturer.\u003c\/li\u003e\n \u003cli\u003eRelease belt tension according to the service-manual procedure and remove the old belt without disturbing the timing positions.\u003c\/li\u003e\n \u003cli\u003eInstall the replacement belt over the correct pulleys, keeping all timing marks aligned.\u003c\/li\u003e\n \u003cli\u003eSet belt tension using the specified tensioning procedure and adjustment values for your exact engine.\u003c\/li\u003e\n \u003cli\u003eRotate the crankshaft by hand through the prescribed number of revolutions and recheck all timing marks and belt tracking.\u003c\/li\u003e\n \u003cli\u003eReinstall the covers and cowling, then reconnect the battery. Do not operate the engine if the timing marks, belt tension, or belt tracking are incorrect.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eMaintenance \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n \u003csummary\u003eWhen should this timing belt be inspected?\u003c\/summary\u003e\n \u003cp\u003eThe company record recommends periodic maintenance at 5 years or 100 hours of use. Inspect the belt at the interval specified in your engine service manual and replace it sooner if it shows damage, contamination, cracking, fraying, glazing, missing teeth, or abnormal wear.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n \u003csummary\u003eDoes this listing include a complete timing-belt kit?\u003c\/summary\u003e\n \u003cp\u003eNo. This product is a single replacement belt. Pulleys, tensioners, covers, gaskets, and other timing-system components are not included.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n \u003csummary\u003eHow do I confirm compatibility?\u003c\/summary\u003e\n \u003cp\u003eMatch your engine brand, exact model, horsepower, stroke, year, and serial number with the compatibility information above and compare the number printed on your original belt. If any detail differs, consult the engine manufacturer or a qualified marine technician before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n \u003csummary\u003eIs this an OEM belt?\u003c\/summary\u003e\n \u003cp\u003eNo. This is an aftermarket replacement belt intended for the listed applications. Yamaha, Mercury, Mariner, and their part numbers are used only to identify engine applications and reference numbers.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n \u003csummary\u003eCan I install it myself?\u003c\/summary\u003e\n \u003cp\u003eTiming-belt installation requires accurate timing alignment and correct tension. It should be performed by an experienced technician using the correct service information and tools for the specific engine.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003eAlways verify the complete engine model, year, stroke, and serial number before purchase.\u003c\/li\u003e\n \u003cli\u003eDo not assume that all F25–F40 or Mercury\/Mariner 4-stroke engines use the same belt.\u003c\/li\u003e\n \u003cli\u003eIncorrect timing or belt tension can cause serious engine damage.\u003c\/li\u003e\n \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n \u003cli\u003eStop installation if the replacement belt, original belt, pulleys, or timing marks do not match the service information for your engine.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eMarine Parts Focus\u003c\/strong\u003e — We provide replacement components for common marine service and repair applications.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eApplication-Based Listings\u003c\/strong\u003e — Product information is organized around engine models and manufacturer reference numbers.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eSupport for Correct Fitment\u003c\/strong\u003e — Compare your original part and engine identification details before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723806380347,"sku":"23BL221","price":42.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/23BL221_1_80cc9ea7-9f39-4723-b7f3-0c01b6e2cee6.jpg?v=1763032259"},{"product_id":"water-pump-repair-kit-fits-yamaha-t25-f30-f40-outboards-replaces-66t-w0078-00-66t-w0078-01","title":"Water Pump Repair Kit Without Housing for Yamaha T25, F30 and F40 4-Stroke Outboards – Replaces 66T-W0078-00-00","description":"\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n table.ss-table th, table.ss-table td {\n padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n }\n table.ss-table th {\n white-space:nowrap;\n word-break:normal;\n letter-spacing:normal;\n font-weight:600;\n background:#f8fafc;\n }\n @media (max-width:480px){\n table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n }\n\u003c\/style\u003e\n\n\u003csection\u003e\n \u003ch2\u003eProduct Details\u003c\/h2\u003e\n \u003cp\u003eThis \u003cstrong\u003ewater pump repair kit without housing\u003c\/strong\u003e is designed for selected Yamaha T25, F30 and F40 4-stroke outboard applications. It replaces the Yamaha water pump repair kit reference \u003cstrong\u003e66T-W0078-00-00\u003c\/strong\u003e and supplies the principal wear components needed to service the water pump and restore dependable cooling-system operation.\u003c\/p\u003e\n \u003cp\u003eThis is an aftermarket replacement kit. It is supplied \u003cstrong\u003ewithout the complete water pump housing\u003c\/strong\u003e; reuse the serviceable original housing or replace it separately when required. A catalog reference associated with this application is Sierra \u003cstrong\u003e18-3440\u003c\/strong\u003e.\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003eWater pump repair kit for selected Yamaha 25–40 hp 4-stroke outboards.\u003c\/li\u003e\n \u003cli\u003eIncludes the impeller, wear plate, insert cup, gaskets, seals, key and fasteners shown below.\u003c\/li\u003e\n \u003cli\u003eDoes not include the complete water pump housing.\u003c\/li\u003e\n \u003cli\u003eVerify the exact engine model, year and serial-number range before ordering.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n \u003ch2\u003ePart Number References\u003c\/h2\u003e\n \u003cp\u003eUse these references when comparing the kit with your original part and service information.\u003c\/p\u003e\n \u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand or Source\u003c\/th\u003e\n \u003cth\u003ePart Number\u003c\/th\u003e\n \u003cth\u003eApplication\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n \u003ctd\u003eWater pump repair kit without housing\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSierra catalog reference\u003c\/td\u003e\n \u003ctd\u003e18-3440\u003c\/td\u003e\n \u003ctd\u003eWater pump kit without housing reference\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n \u003cp\u003eThe catalog relationship read for this repair-kit family identifies the following Yamaha 4-stroke applications. Model designations, shaft configurations and serial-number ranges can affect fitment, so compare your complete engine identification before installation.\u003c\/p\u003e\n \u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Yamaha Engine and Model Compatibility\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand\u003c\/th\u003e\n \u003cth\u003eModel Family\u003c\/th\u003e\n \u003cth\u003eRated HP\u003c\/th\u003e\n \u003cth\u003eStroke\u003c\/th\u003e\n \u003cth\u003eCatalog Years\u003c\/th\u003e\n \u003cth\u003eReplacement Reference\u003c\/th\u003e\n \u003cth\u003eHousing\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eT25\u003c\/td\u003e\n \u003ctd\u003e25\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2001–2004\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n \u003ctd\u003eWithout housing\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF30\u003c\/td\u003e\n \u003ctd\u003e30\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2001–2004\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n \u003ctd\u003eWithout housing\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF40\u003c\/td\u003e\n \u003ctd\u003e40\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2000–2004\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n \u003ctd\u003eWithout housing\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n \u003c\/div\u003e\n \u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e The application ranges above are catalog ranges, not a substitute for checking the model code and serial number on your engine. Do not rely on horsepower alone.\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n \u003cdl\u003e\n \u003cdt\u003eProduct Type\u003c\/dt\u003e\n \u003cdd\u003eOutboard water pump repair kit without housing\u003c\/dd\u003e\n \u003cdt\u003eEngine Type\u003c\/dt\u003e\n \u003cdd\u003eSelected Yamaha 4-stroke outboard engines\u003c\/dd\u003e\n \u003cdt\u003eHorsepower Range\u003c\/dt\u003e\n \u003cdd\u003e25–40 hp applications listed above\u003c\/dd\u003e\n \u003cdt\u003eInstallation\u003c\/dt\u003e\n \u003cdd\u003eReplacement service part; installation should follow the applicable Yamaha service procedure\u003c\/dd\u003e\n \u003cdt\u003eHousing Included\u003c\/dt\u003e\n \u003cdd\u003eNo. The complete water pump housing is not included.\u003c\/dd\u003e\n \u003c\/dl\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003e1 x Pump Housing Cover — 63D-44312-00-00\u003c\/li\u003e\n \u003cli\u003e1 x Insert Cup or Cartridge Insert — 63D-44322-00-00\u003c\/li\u003e\n \u003cli\u003e1 x Wear Plate or Cartridge Outer Plate — 66T-44323-00-00\u003c\/li\u003e\n \u003cli\u003e1 x O-Ring — 93210-59MG7-00\u003c\/li\u003e\n \u003cli\u003e1 x Water Pump Gasket — 63D-44316-00-00\u003c\/li\u003e\n \u003cli\u003e1 x Impeller — application reference 6H4-44352-00-00\u003c\/li\u003e\n \u003cli\u003e1 x Woodruff Key — 90280-03M03-00\u003c\/li\u003e\n \u003cli\u003e4 x Pump Housing Bolts — 90119-08M15-00\u003c\/li\u003e\n \u003cli\u003e4 x Bolt Washers — 90209-08M02-00\u003c\/li\u003e\n \u003cli\u003e1 x Water Seal or Seal Damper — 663-44366-00-00\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003cp\u003e\u003cstrong\u003eNot included:\u003c\/strong\u003e complete water pump housing. Component descriptions may vary slightly by catalog terminology; compare the supplied parts with the removed components before assembly.\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n \u003col\u003e\n \u003cli\u003eDisconnect the battery and make sure the engine is switched off, cool and securely supported.\u003c\/li\u003e\n \u003cli\u003eRemove the lower unit according to the applicable Yamaha service manual.\u003c\/li\u003e\n \u003cli\u003eRemove the existing water pump cover, impeller, wear plate, insert cup, gasket, seals and fasteners. Record the orientation of each component.\u003c\/li\u003e\n \u003cli\u003eBecause this kit does not include the complete housing, inspect the original housing for scoring, cracks, distortion and excessive wear before reuse.\u003c\/li\u003e\n \u003cli\u003eClean all mating surfaces thoroughly and remove old gasket material without damaging the sealing surfaces.\u003c\/li\u003e\n \u003cli\u003eInstall the new gasket, insert cup, wear plate, seals and cover in the correct order and orientation.\u003c\/li\u003e\n \u003cli\u003eMake sure the Woodruff key is properly seated in the driveshaft keyway before installing the impeller.\u003c\/li\u003e\n \u003cli\u003eLightly lubricate the impeller with a water-compatible lubricant and turn the driveshaft in the specified direction while fitting the impeller vanes into the housing.\u003c\/li\u003e\n \u003cli\u003eInstall the bolts and washers and tighten them to the torque specified in the applicable Yamaha service manual.\u003c\/li\u003e\n \u003cli\u003eReinstall the lower unit, ensuring that the water tube enters the pump outlet correctly.\u003c\/li\u003e\n \u003cli\u003eRun the engine with an appropriate flushing device before use and confirm a steady tell-tale water stream. Stop immediately if the engine overheats or water flow is abnormal.\u003c\/li\u003e\n \u003c\/ol\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n \u003cdetails\u003e\n \u003csummary\u003eHow do I know if the water pump needs service?\u003c\/summary\u003e\n \u003cp\u003eCommon symptoms include a weak or intermittent tell-tale stream, an overheating alarm, higher-than-normal operating temperature or visible impeller damage. Always investigate the complete cooling system rather than replacing parts based on one symptom alone.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eDoes this kit include the water pump housing?\u003c\/summary\u003e\n \u003cp\u003eNo. This is the repair-kit version without the complete housing. Inspect the original housing and replace it separately if it is worn, damaged or no longer provides the required sealing and clearance.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eWhich Yamaha engines are covered?\u003c\/summary\u003e\n \u003cp\u003eThe catalog range associated with this repair-kit reference identifies Yamaha T25 models from 2001–2004, F30 models from 2001–2004 and F40 models from 2000–2004. Confirm the exact model code and serial number before ordering.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eIs this kit for 2-stroke or 4-stroke engines?\u003c\/summary\u003e\n \u003cp\u003eThis listing is intended for the Yamaha 4-stroke applications shown in the compatibility table. Do not use the kit on a 2-stroke engine solely because the horsepower rating appears similar.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eCan I replace only the impeller?\u003c\/summary\u003e\n \u003cp\u003eA new impeller can sometimes be installed separately, but the wear plate, insert cup, gasket, O-ring, seal and fasteners also affect pump performance. Replacing the complete repair-kit contents is recommended when these parts show wear or when the pump is being serviced as preventive maintenance.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eIs this an OEM Yamaha part?\u003c\/summary\u003e\n \u003cp\u003eNo. This is an aftermarket replacement kit intended to match the listed application and replacement reference. Yamaha and other brand names and part numbers are used only to identify compatibility and reference parts.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eWhat should I verify before purchase?\u003c\/summary\u003e\n \u003cp\u003eVerify the engine brand, model code, horsepower, stroke, year, shaft configuration and serial-number range. Also confirm that your existing housing is reusable because the complete housing is not included in this kit.\u003c\/p\u003e\n \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n \u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003eUse the applicable Yamaha service manual for removal, installation and torque specifications.\u003c\/li\u003e\n \u003cli\u003eDo not operate the engine without an adequate water supply or flushing device.\u003c\/li\u003e\n \u003cli\u003eStop the engine immediately if the tell-tale stream is weak, the temperature rises unexpectedly or an overheating alarm occurs.\u003c\/li\u003e\n \u003cli\u003eProfessional installation is recommended if you are not experienced with outboard lower-unit or water-pump service.\u003c\/li\u003e\n \u003cli\u003eCompare the supplied components with your original parts before installation; model and serial-number differences can change fitment.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — Service parts for common outboard maintenance and repair applications.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listings\u003c\/strong\u003e — Product information is organized around engine model and replacement-part references.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eSupport for Installation Planning\u003c\/strong\u003e — Check the complete engine identification and applicable service information before ordering.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723806413115,"sku":"23KY709","price":68.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/23KY709_8_4c8da290-41b3-4c74-837a-5f03b0f0e50b.jpg?v=1763032261"},{"product_id":"water-pump-impeller-kit-fits-yamaha-25hp-40hp-replaces-66t-w0078-a0-18-3432-89890","title":"Water Pump Impeller Replacement for Yamaha T25, F30 and F40 Outboards","description":"\u003csection id=\"product-details\"\u003e\n \u003ch2\u003eProduct Details\u003c\/h2\u003e\n \u003cp\u003eThis aftermarket water pump impeller replacement is designed for selected Yamaha T25, F30 and F40 outboard engines. It replaces the impeller used with Yamaha water pump reference 66T-W0078-A0 and is intended to restore proper cooling-water circulation during routine water pump service.\u003c\/p\u003e\n \u003cp\u003eCatalog evidence associates the 66T water pump application with Yamaha T25 models from 2001–2004, F30 models from 2001–2004, and F40 models from 2000–2004. Always confirm the exact model, year and original impeller before ordering.\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003eAftermarket replacement impeller for selected Yamaha outboards.\u003c\/li\u003e\n \u003cli\u003eDesigned for direct replacement when the original application and dimensions match.\u003c\/li\u003e\n \u003cli\u003eHelps restore water pump flow and reduce the risk of overheating caused by a worn impeller.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003cstyle\u003e\n .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n table.ss-table th, table.ss-table td {\n padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n }\n table.ss-table th {\n white-space:nowrap;\n word-break:normal;\n letter-spacing:normal;\n font-weight:600;\n background:#f8fafc;\n }\n @media (max-width:480px){\n table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n }\n\u003c\/style\u003e\n\n\u003csection id=\"part-number-matrix\"\u003e\n \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n \u003cp\u003eUse these references to compare the required Yamaha water pump application. Reference numbers are supplied for identification only; they do not replace confirmation of the complete engine model and year.\u003c\/p\u003e\n \u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand\u003c\/th\u003e\n \u003cth\u003eReference Type\u003c\/th\u003e\n \u003cth\u003ePart Number\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eOEM reference\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-A0\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eRelated catalog reference\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-compatibility\"\u003e\n \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n \u003cp\u003eThe applications below are the model, horsepower, stroke and year conditions associated with the 66T water pump application in the available catalog evidence. Confirm the complete model code and compare the original part before installation.\u003c\/p\u003e\n \u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand\u003c\/th\u003e\n \u003cth\u003eModel Family\u003c\/th\u003e\n \u003cth\u003eRated HP\u003c\/th\u003e\n \u003cth\u003eStroke\u003c\/th\u003e\n \u003cth\u003eYears\u003c\/th\u003e\n \u003cth\u003eReference\u003c\/th\u003e\n \u003cth\u003eNotes\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eT25\u003c\/td\u003e\n \u003ctd\u003e25\u003c\/td\u003e\n \u003ctd\u003e2-Stroke\u003c\/td\u003e\n \u003ctd\u003e2001–2004\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-A0\u003c\/td\u003e\n \u003ctd\u003eConfirm the complete model code.\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF30\u003c\/td\u003e\n \u003ctd\u003e30\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2001–2004\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-A0\u003c\/td\u003e\n \u003ctd\u003eConfirm the complete model code.\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF40\u003c\/td\u003e\n \u003ctd\u003e40\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2000–2004\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-A0\u003c\/td\u003e\n \u003ctd\u003eConfirm the complete model code.\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"technical-specs\"\u003e\n \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n \u003cdl\u003e\n \u003cdt\u003eProduct Type\u003c\/dt\u003e\n \u003cdd\u003eWater pump impeller replacement\u003c\/dd\u003e\n \u003cdt\u003eApplication\u003c\/dt\u003e\n \u003cdd\u003eSelected Yamaha T25, F30 and F40 outboards\u003c\/dd\u003e\n \u003cdt\u003eInstallation\u003c\/dt\u003e\n \u003cdd\u003eDirect replacement when the original application and dimensions match\u003c\/dd\u003e\n \u003cdt\u003eHousing\u003c\/dt\u003e\n \u003cdd\u003eImpeller replacement only; water pump housing is not included\u003c\/dd\u003e\n \u003cdt\u003eBrand Status\u003c\/dt\u003e\n \u003cdd\u003eAftermarket replacement; not an Original Equipment Manufacturer part\u003c\/dd\u003e\n \u003c\/dl\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"package-contents\"\u003e\n \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1 x\u003c\/span\u003e Water pump impeller\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003cp\u003eWater pump housing, wear plate, gaskets, O-rings, bolts and impeller key are not included unless specifically shown in the package supplied with the order.\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"installation-notes\"\u003e\n \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n \u003col\u003e\n \u003cli\u003eDisconnect the battery and place the outboard in neutral.\u003c\/li\u003e\n \u003cli\u003eRemove the lower unit according to the applicable Yamaha service procedure.\u003c\/li\u003e\n \u003cli\u003eRemove the water pump cover and inspect the housing, wear plate, key and mating surfaces for damage or excessive wear.\u003c\/li\u003e\n \u003cli\u003eRemove the old impeller and key, if fitted, while noting the direction of the impeller vanes.\u003c\/li\u003e\n \u003cli\u003eClean all gasket surfaces and remove old gasket material before assembly.\u003c\/li\u003e\n \u003cli\u003eInstall the impeller with the correct key and bend the vanes in the proper direction for the pump rotation.\u003c\/li\u003e\n \u003cli\u003eReassemble the pump cover using the manufacturer’s specified tightening sequence and torque.\u003c\/li\u003e\n \u003cli\u003eReinstall the lower unit, aligning the driveshaft, shift shaft and water tube carefully.\u003c\/li\u003e\n \u003cli\u003eRun the engine using an appropriate water supply and confirm a strong, steady tell-tale stream before normal operation.\u003c\/li\u003e\n \u003c\/ol\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"faq\"\u003e\n \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n \u003cdetails\u003e\n \u003csummary\u003eHow do I confirm that this impeller fits my Yamaha outboard?\u003c\/summary\u003e\n \u003cp\u003eConfirm that your engine is a Yamaha T25 from 2001–2004, F30 from 2001–2004, or F40 from 2000–2004, then compare the complete model code, original impeller and water pump configuration. Horsepower alone is not sufficient to confirm fitment.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eDoes this product include a complete water pump kit?\u003c\/summary\u003e\n \u003cp\u003eNo. This listing is for a replacement water pump impeller only. The housing, wear plate, gaskets, O-rings, bolts and key are not included unless expressly stated in the order package.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\n \u003cp\u003eCommon signs include a weak or missing tell-tale stream, overheating warnings, rising operating temperature and reduced cooling-water flow. A cracked, brittle, torn or permanently deformed impeller should be replaced.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eShould the water pump housing and wear plate also be replaced?\u003c\/summary\u003e\n \u003cp\u003eInspect the housing and wear plate whenever the impeller is replaced. Replace any component that is scored, warped, damaged or excessively worn, because damaged pump surfaces can reduce water flow and shorten impeller life.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eHow often should a water pump impeller be replaced?\u003c\/summary\u003e\n \u003cp\u003eReplace the impeller according to the engine manufacturer’s maintenance schedule or sooner if the outboard has been operated in sandy, silty or debris-heavy water. Seasonal inspection is recommended for frequently used engines.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\n \u003cp\u003eNo. This is an aftermarket replacement component intended for the specified Yamaha application.\u003c\/p\u003e\n \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"safety-info\"\u003e\n \u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003eVerify the complete engine model, year, stroke and original part before purchase.\u003c\/li\u003e\n \u003cli\u003eDo not rely on horsepower alone to determine compatibility.\u003c\/li\u003e\n \u003cli\u003eCompare the original impeller dimensions and key arrangement before installation.\u003c\/li\u003e\n \u003cli\u003eDo not operate the outboard without an adequate water supply.\u003c\/li\u003e\n \u003cli\u003eProfessional installation is recommended if you are not familiar with lower-unit or water-pump service.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"about-us\"\u003e\n \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — We supply aftermarket components for routine outboard maintenance and repair.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Information\u003c\/strong\u003e — Product details are organized around model, year, horsepower and stroke conditions to help customers verify fitment.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eService Support\u003c\/strong\u003e — If your original part or engine model differs from the information shown, contact support before installation.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723806445883,"sku":"23KY082","price":22.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_for_Yamaha_25HP-40HP_66T-W0078-A0_-_JLM_MARINE-8289029.jpg?v=1763032262"},{"product_id":"carburetor-assembly-sea-sierra-marine-yamaha-75-85-hp-replaces-yamaha-688-14301-08-688-14301-40-00-688-14301-41-00-688-14301-42-00","title":"Carburetor Assembly for Yamaha 75\/85 HP 2-Stroke Outboards – Replaces 688-14301-08","description":"\u003csection\u003e\n\u003cstyle\u003e\n .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n table.ss-table th, table.ss-table td {\n padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n }\n table.ss-table th {\n white-space:nowrap;\n word-break:normal;\n letter-spacing:normal;\n font-weight:600;\n background:#f8fafc;\n }\n @media (max-width:480px){\n table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003ecarburetor assembly\u003c\/strong\u003e is listed for Yamaha 75 HP and 85 HP 2-stroke outboard applications. It is intended as a replacement for the carburetor identified by Yamaha part number \u003cstrong\u003e688-14301-08\u003c\/strong\u003e. Before ordering, compare the part number, mounting arrangement, linkage connections, and product images with the carburetor removed from your engine.\u003c\/p\u003e\n\u003cp\u003eBecause outboard fitment can vary by model configuration and production specification, the horsepower rating alone is not sufficient to confirm compatibility. Verify your complete engine model and the number on your original carburetor before installation.\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eAftermarket carburetor assembly for selected Yamaha 75\/85 HP 2-stroke outboards.\u003c\/li\u003e\n \u003cli\u003eDesigned as a replacement for the Yamaha reference number listed below.\u003c\/li\u003e\n \u003cli\u003eUses OEM-style mounting and connection points for the applicable engine application.\u003c\/li\u003e\n \u003cli\u003eInspect all fuel lines, linkages, seals, and mounting hardware before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Reference\u003c\/h2\u003e\n\u003cp\u003eUse the following manufacturer reference to compare your original component. A matching number is an important fitment check, but the complete engine model and configuration should also be verified.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Part Number Reference\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand\u003c\/th\u003e\n \u003cth\u003ePart Number\u003c\/th\u003e\n \u003cth\u003eReference\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e688-14301-08\u003c\/td\u003e\n \u003ctd\u003eReplacement reference\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe available product record identifies this assembly for Yamaha 75 HP and 85 HP 2-stroke outboards. No specific model-year, serial-number, shaft-length, or individual model-code range is confirmed in the available product data. Confirm those details against your engine identification plate and original carburetor before purchase.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Engine Compatibility\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand\u003c\/th\u003e\n \u003cth\u003eApplication\u003c\/th\u003e\n \u003cth\u003eRated HP\u003c\/th\u003e\n \u003cth\u003eStroke\u003c\/th\u003e\n \u003cth\u003eModel Year\u003c\/th\u003e\n \u003cth\u003eReference Part No.\u003c\/th\u003e\n \u003cth\u003eFitment Guidance\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eOutboard\u003c\/td\u003e\n \u003ctd\u003e75\u003c\/td\u003e\n \u003ctd\u003e2-Stroke\u003c\/td\u003e\n \u003ctd\u003eNot specified\u003c\/td\u003e\n \u003ctd\u003e688-14301-08\u003c\/td\u003e\n \u003ctd\u003eVerify the complete engine model and original carburetor.\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eOutboard\u003c\/td\u003e\n \u003ctd\u003e85\u003c\/td\u003e\n \u003ctd\u003e2-Stroke\u003c\/td\u003e\n \u003ctd\u003eNot specified\u003c\/td\u003e\n \u003ctd\u003e688-14301-08\u003c\/td\u003e\n \u003ctd\u003eVerify the complete engine model and original carburetor.\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n \u003cdt\u003eProduct Type\u003c\/dt\u003e\n \u003cdd\u003eCarburetor assembly\u003c\/dd\u003e\n \u003cdt\u003eApplication\u003c\/dt\u003e\n \u003cdd\u003eSelected Yamaha 75\/85 HP 2-stroke outboards\u003c\/dd\u003e\n \u003cdt\u003eReplacement Reference\u003c\/dt\u003e\n \u003cdd\u003eYamaha 688-14301-08\u003c\/dd\u003e\n \u003cdt\u003eFuel System\u003c\/dt\u003e\n \u003cdd\u003eCarbureted gasoline outboard fuel system\u003c\/dd\u003e\n \u003cdt\u003eInstallation\u003c\/dt\u003e\n \u003cdd\u003eReplacement installation using the applicable original mounting and linkage arrangement\u003c\/dd\u003e\n \u003cdt\u003eFitment\u003c\/dt\u003e\n \u003cdd\u003eVerify against the original carburetor and complete engine identification before ordering\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e1 x Carburetor assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eGaskets, seals, fasteners, hoses, and adjustment components are not listed as included unless shown in the product images or separately specified. Reuse of old gaskets is not recommended; obtain any required replacement sealing components before installation.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n \u003cli\u003ePlace the boat securely, stop the engine, disconnect the battery, and shut off the fuel supply.\u003c\/li\u003e\n \u003cli\u003eAllow the engine to cool and work in a well-ventilated area away from sparks or open flames.\u003c\/li\u003e\n \u003cli\u003ePhotograph or mark the fuel lines, throttle linkage, choke linkage, and other connections before removal.\u003c\/li\u003e\n \u003cli\u003eDisconnect the fuel lines and linkages, taking care to prevent dirt from entering the fuel system.\u003c\/li\u003e\n \u003cli\u003eRemove the fasteners securing the original carburetor and clean the mounting surface.\u003c\/li\u003e\n \u003cli\u003eInstall the replacement assembly with the correct new gasket or sealing components for the engine.\u003c\/li\u003e\n \u003cli\u003eReconnect the fuel lines and all linkages, confirming that the throttle and choke operate smoothly through their full range.\u003c\/li\u003e\n \u003cli\u003eRestore the fuel supply and inspect carefully for leaks before starting the engine.\u003c\/li\u003e\n \u003cli\u003eStart and test the engine according to the applicable Yamaha service information. Do not adjust mixture or idle settings beyond the manufacturer's specified procedure.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n \u003csummary\u003eHow do I confirm that this carburetor will fit my engine?\u003c\/summary\u003e\n \u003cp\u003eConfirm that your engine is a Yamaha 75 HP or 85 HP 2-stroke outboard, then compare the complete engine model, original carburetor, mounting pattern, linkage arrangement, and reference number 688-14301-08. If any of these details differ, contact the seller before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n \u003csummary\u003eDoes this fit Yamaha 4-stroke engines?\u003c\/summary\u003e\n \u003cp\u003eCompatibility is listed for Yamaha 2-stroke applications only. Do not use this listing to establish fitment for a 4-stroke engine.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n \u003csummary\u003eDoes this fit Yamaha 25-40 HP or other brands?\u003c\/summary\u003e\n \u003cp\u003eNo such applications are confirmed by the available product record. Do not assume compatibility with smaller Yamaha models, Selva, Parsun, Hidea, Seapro, HDX, or other brands without a separately verified matching part number and application.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n \u003csummary\u003eWhat should I inspect before installing the replacement?\u003c\/summary\u003e\n \u003cp\u003eCheck the fuel lines, filter, tank, mounting surface, gasket, throttle and choke linkages, and fuel connections. Contaminated fuel or debris elsewhere in the system can affect the replacement carburetor.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n \u003csummary\u003eAre adjustments needed after installation?\u003c\/summary\u003e\n \u003cp\u003eFollow the service procedure for your exact engine model. Idle or mixture settings may require checking after installation, but adjustments should be made only within the manufacturer's specified limits.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n \u003csummary\u003eWhat are common symptoms of a carburetor or fuel-system problem?\u003c\/summary\u003e\n \u003cp\u003ePossible symptoms include hard starting, unstable idle, stalling, hesitation during acceleration, poor throttle response, fuel leakage, or an overly rich or lean running condition. These symptoms can also be caused by fuel contamination, ignition faults, air leaks, or incorrect adjustment.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n \u003csummary\u003eIs this a genuine Yamaha part?\u003c\/summary\u003e\n \u003cp\u003eNo. This listing is for an aftermarket replacement carburetor assembly intended for the stated application. Yamaha is referenced only for engine and replacement-part identification.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003eFuel is flammable. Work in a ventilated area with the engine stopped and away from ignition sources.\u003c\/li\u003e\n \u003cli\u003eVerify the complete engine model, stroke, original carburetor, and reference number before ordering.\u003c\/li\u003e\n \u003cli\u003eDo not rely on horsepower alone to confirm fitment.\u003c\/li\u003e\n \u003cli\u003eUse new sealing components where required and check carefully for fuel leaks before operation.\u003c\/li\u003e\n \u003cli\u003eProfessional installation is recommended if you are not familiar with outboard fuel systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — Replacement components for selected marine engine applications.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listings\u003c\/strong\u003e — Compare the stated engine application and original part reference before ordering.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eSupport Before Purchase\u003c\/strong\u003e — Provide your complete engine model and original part details when fitment assistance is needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723806478651,"sku":"JLM23CA107","price":308.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Carburetor_for_Yamaha_75_85HP_2_stroke_688-14301_-_JLM_MARINE-8290542.jpg?v=1763032264"},{"product_id":"water-pump-impeller-kit-fits-yamaha-t25-f40-replaces-66t-w0078-00-00-18-3413","title":"Water Pump Repair Kit Without Housing – Fits Yamaha T25, F30 \u0026 F40 (Replaces 66T-W0078-00-00, Sierra 18-3440)","description":"\u003csection\u003e\n\u003cstyle\u003e\n .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n table.ss-table th, table.ss-table td { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n table.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n @media (max-width:480px){ table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; } }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003ewater pump repair kit without the main pump housing\u003c\/strong\u003e is designed for selected Yamaha T25, F30 and F40 outboard applications. It supplies the impeller, wear plate, insert cup, gaskets, seals, O-ring, key and mounting hardware needed for a water pump service while allowing you to reuse the existing pump housing when it is serviceable.\u003c\/p\u003e\n\u003cp\u003eThe kit corresponds to Yamaha OEM reference \u003cstrong\u003e66T-W0078-00-00\u003c\/strong\u003e and is listed as the no-housing replacement for Sierra \u003cstrong\u003e18-3440\u003c\/strong\u003e. It is not the separate with-housing version associated with Sierra 18-3413, and the main water pump housing body is not included.\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eReplacement water pump service kit for selected Yamaha outboards.\u003c\/li\u003e\n \u003cli\u003eIncludes a neoprene impeller, replacement wear plate, insert cup, key, gaskets, seals, O-ring and four bolt-and-washer positions.\u003c\/li\u003e\n \u003cli\u003eUse your existing pump housing only if it is free from excessive scoring, corrosion, cracks or distortion.\u003c\/li\u003e\n \u003cli\u003eAftermarket replacement part; not manufactured by Yamaha.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse these references together with the exact engine model and year to confirm suitability before ordering.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand or Source\u003c\/th\u003e\n\u003cth\u003eReference\u003c\/th\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n\u003ctd\u003eOEM reference for the no-housing repair kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e66T-W0078-00\u003c\/td\u003e\n\u003ctd\u003eRelated with-housing reference; verify kit configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3440\u003c\/td\u003e\n\u003ctd\u003eWater pump kit without housing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3413\u003c\/td\u003e\n\u003ctd\u003eSeparate with-housing kit; not the configuration described here\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket\u003c\/td\u003e\n\u003ctd\u003eMAL9-48610\u003c\/td\u003e\n\u003ctd\u003eCross-reference supplied in aftermarket mapping; verify configuration before purchase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket\u003c\/td\u003e\n\u003ctd\u003eAM66T-W0078-00\u003c\/td\u003e\n\u003ctd\u003eCross-reference supplied in aftermarket mapping; verify configuration before purchase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe catalog relationship for the no-housing configuration covers the following Yamaha model families and year ranges. Model suffixes, shaft configuration and serial-number breaks may affect fitment, so compare the exact engine identification before installation.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel Family\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eYears Listed\u003c\/th\u003e\n\u003cth\u003eOEM Reference\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eT25\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2001–2006\u003c\/td\u003e\n\u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF30\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2001–2005\u003c\/td\u003e\n\u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF40\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2008\u003c\/td\u003e\n\u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Horsepower alone is not sufficient to confirm fitment. Check the complete model designation, year, serial-number range and the reference number on the original water pump components.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eWater pump repair kit without main housing\u003c\/dd\u003e\n \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eReplacement service kit for selected Yamaha outboards\u003c\/dd\u003e\n \u003cdt\u003eImpeller Material\u003c\/dt\u003e\n\u003cdd\u003eNeoprene rubber\u003c\/dd\u003e\n \u003cdt\u003eImpeller Design\u003c\/dt\u003e\n\u003cdd\u003e6-blade impeller\u003c\/dd\u003e\n \u003cdt\u003eKeyway\u003c\/dt\u003e\n\u003cdd\u003eIncluded through the supplied impeller key\u003c\/dd\u003e\n \u003cdt\u003eMain Pump Housing\u003c\/dt\u003e\n\u003cdd\u003eNot included; reuse the existing housing if serviceable\u003c\/dd\u003e\n \u003cdt\u003eKit Type\u003c\/dt\u003e\n\u003cdd\u003eAftermarket replacement\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e1 x Water pump impeller, OEM reference 6H4-44352-00-00\u003c\/li\u003e\n \u003cli\u003e1 x Impeller wear plate, OEM reference 66T-44323-00-00\u003c\/li\u003e\n \u003cli\u003e1 x Insert cup\u003c\/li\u003e\n \u003cli\u003e1 x Impeller Woodruff key, OEM reference 90280-03M03-00\u003c\/li\u003e\n \u003cli\u003e1 x Water pump case gasket, OEM reference 63D-44316-00-00\u003c\/li\u003e\n \u003cli\u003e1 x Pump housing cover\u003c\/li\u003e\n \u003cli\u003e1 x O-ring, OEM reference 93210-59MG7-00\u003c\/li\u003e\n \u003cli\u003e1 x Water seal, OEM reference 663-44366-00-00\u003c\/li\u003e\n \u003cli\u003e4 x Bolts with washers, OEM bolt reference 90119-08M15-00\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included:\u003c\/strong\u003e the main water pump housing body. Inspect the original housing and replace it separately if it is worn or damaged.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n \u003cli\u003eDisconnect the battery and remove the ignition-kill switch lanyard.\u003c\/li\u003e\n \u003cli\u003eShift the outboard into the position recommended by the service manual to simplify driveshaft and shift-shaft alignment.\u003c\/li\u003e\n \u003cli\u003eRemove the lower unit from the outboard’s midsection using the procedure for your exact model.\u003c\/li\u003e\n \u003cli\u003eRemove the existing water pump cover and service components.\u003c\/li\u003e\n \u003cli\u003eSlide the old impeller off the driveshaft and remove the old impeller key.\u003c\/li\u003e\n \u003cli\u003eInspect the reusable pump housing, cover and wear surfaces for scoring, corrosion, cracks or distortion. Do not reuse damaged parts.\u003c\/li\u003e\n \u003cli\u003eClean all mating surfaces. Install the new gasket, key, impeller, wear plate, insert cup, seals and O-ring in the correct order.\u003c\/li\u003e\n \u003cli\u003eRotate the driveshaft in the direction specified by the service manual while lowering the housing cover so the impeller blades seat correctly.\u003c\/li\u003e\n \u003cli\u003eInstall the supplied bolts and washers and tighten them in a crisscross pattern to the manufacturer’s specified torque.\u003c\/li\u003e\n \u003cli\u003eReinstall the lower unit, ensuring that the driveshaft, shift shaft and water tube are correctly aligned.\u003c\/li\u003e\n \u003cli\u003eRun the engine only with an appropriate water supply and verify a steady tell-tale stream before normal operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know whether this kit fits my engine?\u003c\/summary\u003e\u003cp\u003eConfirm the complete Yamaha model designation and year, then compare the original water pump reference with 66T-W0078-00-00 or the no-housing Sierra reference 18-3440. Do not rely on horsepower alone.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes this kit include the complete water pump housing?\u003c\/summary\u003e\u003cp\u003eNo. This is the no-housing configuration. It includes a pump housing cover and service components, but not the main pump housing body. Reuse the original housing only if it is in good condition.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the symptoms of a worn impeller?\u003c\/summary\u003e\u003cp\u003eTypical symptoms include a weak or intermittent tell-tale stream, overheating warnings, reduced cooling performance or steam near the exhaust. Stop operating the engine if it overheats and inspect the cooling system.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShould the pump housing be replaced at the same time?\u003c\/summary\u003e\u003cp\u003eReplace the housing if it has deep grooves, corrosion, cracks, distortion or excessive clearance around the impeller. A new impeller cannot compensate for a severely worn housing.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM Yamaha kit?\u003c\/summary\u003e\u003cp\u003eNo. This listing is for an aftermarket replacement kit that uses the stated Yamaha and Sierra references for identification and compatibility checking.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should the impeller be replaced?\u003c\/summary\u003e\u003cp\u003eInspect the impeller during scheduled maintenance and replace it according to the engine manufacturer’s service guidance. Frequent operation in saltwater, sand or silt may require more frequent inspection.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I install this kit myself?\u003c\/summary\u003e\u003cp\u003eWater pump service requires removal and correct reinstallation of the lower unit. Follow the service manual for your exact engine, use the specified torque values and seek professional assistance if you are unsure.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003eVerify the exact model, year, serial-number range and original part reference before purchase.\u003c\/li\u003e\n \u003cli\u003eDo not install this kit on an engine whose water pump configuration differs from the listed application.\u003c\/li\u003e\n \u003cli\u003eDo not operate the outboard without an adequate water supply.\u003c\/li\u003e\n \u003cli\u003eReplace any damaged or excessively worn reusable pump components before returning the engine to service.\u003c\/li\u003e\n \u003cli\u003eThis is an aftermarket replacement part, not an OEM Yamaha component.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — We supply practical replacement components for routine outboard maintenance and repair.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listings\u003c\/strong\u003e — Product references and model information are provided to help you compare the part with your original equipment.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eSupport for Fitment Questions\u003c\/strong\u003e — When in doubt, provide the complete engine model and serial information before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723806511419,"sku":"SIE-17KY012","price":45.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/SIE-17KY012_1_80e06614-0072-45e1-baa4-ea1c0f6846dc.jpg?v=1763032265"},{"product_id":"water-pump-impeller-kit-for-yamaha-t25-hp-38837-f30-hp-38837-f40-hp-00-05-66t-w0078-00","title":"Water Pump Service Kit with Housing for Yamaha T25, F30 and F40 4-Stroke Outboards, 2000–2009","description":"\u003csection\u003e\n\u003cstyle\u003e\n .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n table.ss-table th, table.ss-table td { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n table.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n @media (max-width:480px){ table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; } }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003ewater pump service kit with housing\u003c\/strong\u003e is designed for selected Yamaha T25, F30 and F40 4-stroke outboard engines from model years 2000–2009. It provides the main components needed to service the water pump and restore reliable cooling-system water circulation.\u003c\/p\u003e\n\u003cp\u003eThe kit is supplied with a water pump housing and is intended as a replacement for the Yamaha water pump assembly identified by OEM reference \u003cstrong\u003e66T-W0078-00\u003c\/strong\u003e. Related catalog references include Yamaha \u003cstrong\u003e66T-44311-00\u003c\/strong\u003e and Sierra water pump kit references \u003cstrong\u003e18-3413\u003c\/strong\u003e and \u003cstrong\u003e18-3440\u003c\/strong\u003e. Always compare the original pump, engine model and model year before ordering.\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eWater pump service kit supplied with housing.\u003c\/li\u003e\n \u003cli\u003eFor Yamaha T25, F30 and F40 4-stroke outboards within the stated year range.\u003c\/li\u003e\n \u003cli\u003eIncludes the impeller, pump-service sealing components and related pump hardware listed below.\u003c\/li\u003e\n \u003cli\u003eAftermarket replacement part; Yamaha and Sierra names and numbers are used only to identify application and reference compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThese are customer-facing manufacturer or aftermarket reference numbers associated with this water pump service application. They are provided for identification only and do not indicate that the product is manufactured by Yamaha or Sierra.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eReference Number\u003c\/th\u003e\n\u003cth\u003eReference Type\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e66T-W0078-00\u003c\/td\u003e\n\u003ctd\u003eOEM water pump kit reference\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e66T-44311-00\u003c\/td\u003e\n\u003ctd\u003eOEM water pump housing reference\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3413\u003c\/td\u003e\n\u003ctd\u003eAftermarket water pump kit reference\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3440\u003c\/td\u003e\n\u003ctd\u003eAftermarket water pump kit reference\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eCompany fitment information identifies this service kit for Yamaha 4-stroke T25, F30 and F40 outboards from 2000 through 2009. Model suffixes, shaft lengths and regional configurations can affect fitment, so verify the complete model designation and the existing water pump before installation.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel Family\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eModel Years\u003c\/th\u003e\n\u003cth\u003ePrimary OEM Reference\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eT25\u003c\/td\u003e\n\u003ctd\u003e25 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2009\u003c\/td\u003e\n\u003ctd\u003e66T-W0078-00\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF30\u003c\/td\u003e\n\u003ctd\u003e30 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2009\u003c\/td\u003e\n\u003ctd\u003e66T-W0078-00\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF40\u003c\/td\u003e\n\u003ctd\u003e40 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2009\u003c\/td\u003e\n\u003ctd\u003e66T-W0078-00\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n \u003cdt\u003eProduct Type\u003c\/dt\u003e\n \u003cdd\u003eWater pump service kit with housing\u003c\/dd\u003e\n \u003cdt\u003eApplication\u003c\/dt\u003e\n \u003cdd\u003eYamaha T25, F30 and F40 4-stroke outboards\u003c\/dd\u003e\n \u003cdt\u003eFitment Years\u003c\/dt\u003e\n \u003cdd\u003e2000–2009\u003c\/dd\u003e\n \u003cdt\u003eInstallation\u003c\/dt\u003e\n \u003cdd\u003eReplacement water pump service components; verify the existing assembly before installation\u003c\/dd\u003e\n \u003cdt\u003eBrand Status\u003c\/dt\u003e\n \u003cdd\u003eAftermarket replacement, not an OEM Yamaha component\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cp\u003eThe service-kit configuration includes the following pump-service components. Quantities are based on the catalog component listing for the with-housing application.\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003e1 x Water pump housing\u003c\/li\u003e\n \u003cli\u003e1 x Water pump impeller\u003c\/li\u003e\n \u003cli\u003e1 x Water pump case gasket\u003c\/li\u003e\n \u003cli\u003e1 x Wear plate\u003c\/li\u003e\n \u003cli\u003e1 x Impeller key\u003c\/li\u003e\n \u003cli\u003e1 x Insert cup\u003c\/li\u003e\n \u003cli\u003e1 x Pump housing cover\u003c\/li\u003e\n \u003cli\u003e1 x O-ring\u003c\/li\u003e\n \u003cli\u003e1 x Water seal\u003c\/li\u003e\n \u003cli\u003e4 x Bolts and 4 x bolt washers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n \u003cli\u003eDisconnect the battery and follow the safety procedures in the applicable Yamaha service manual.\u003c\/li\u003e\n \u003cli\u003eRemove the lower unit from the outboard.\u003c\/li\u003e\n \u003cli\u003eRemove the existing water pump components and inspect the driveshaft, keyway and mounting surfaces.\u003c\/li\u003e\n \u003cli\u003eClean away old gasket material and debris before installing the replacement parts.\u003c\/li\u003e\n \u003cli\u003eInstall the gasket, wear plate, insert cup, seal and other service components in the correct order.\u003c\/li\u003e\n \u003cli\u003eFit the impeller with the key properly seated. Confirm the impeller-vane orientation and rotate the driveshaft as specified by the service manual.\u003c\/li\u003e\n \u003cli\u003eInstall the supplied housing, cover, bolts and washers. Tighten all fasteners to the manufacturer's specified torque.\u003c\/li\u003e\n \u003cli\u003eReinstall the lower unit, reconnect the battery and test the engine in an appropriate water supply.\u003c\/li\u003e\n \u003cli\u003eConfirm a strong tell-tale stream and check carefully for leaks or overheating before normal operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I confirm that this kit fits my Yamaha outboard?\u003c\/summary\u003e\u003cp\u003eConfirm that your engine is a Yamaha T25, F30 or F40 4-stroke model from 2000–2009 and compare the existing water pump and OEM reference with the information above. Verify the complete model designation before purchase because suffixes and configurations can vary.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes this kit include the water pump housing?\u003c\/summary\u003e\u003cp\u003eYes. The company product description identifies this product as a water pump service kit with housing.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a worn water pump?\u003c\/summary\u003e\u003cp\u003eCommon signs include a weak or missing tell-tale stream, overheating, a temperature warning, or visible damage to the impeller and pump housing. Stop operation if the engine overheats and inspect the cooling system.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShould all service-kit components be replaced together?\u003c\/summary\u003e\u003cp\u003eFor a complete water pump service, replace the included wear, sealing and pump components as appropriate for the condition of the old assembly. Follow the engine manufacturer's service procedures and inspect the driveshaft and mating surfaces during installation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM Yamaha kit?\u003c\/summary\u003e\u003cp\u003eNo. This is an aftermarket replacement kit. Yamaha OEM numbers are included only as application and identification references.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should the water pump be serviced?\u003c\/summary\u003e\u003cp\u003eService intervals depend on the engine manufacturer's schedule and operating conditions. Inspect the water pump regularly, especially after operation in saltwater, silty water or areas with heavy debris.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003eVerify the complete engine model, year and existing pump assembly before ordering.\u003c\/li\u003e\n \u003cli\u003eDo not operate the outboard without an adequate water supply for cooling.\u003c\/li\u003e\n \u003cli\u003eUse the applicable service manual for removal, installation and torque specifications.\u003c\/li\u003e\n \u003cli\u003eProfessional installation is recommended if you are not familiar with lower-unit or water-pump service.\u003c\/li\u003e\n \u003cli\u003eThis is an aftermarket replacement part and is not manufactured or endorsed by Yamaha.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — We provide aftermarket components for routine boat and outboard maintenance.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listings\u003c\/strong\u003e — Product descriptions identify the supported engine families and reference numbers to help with part selection.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eService-Oriented Support\u003c\/strong\u003e — Compare your original component and engine identification information before installation for the best fit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723806544187,"sku":"23KY079","price":38.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/23KY0791_f2f3651a-7781-4fe3-9428-4c2e83a11f98.jpg?v=1763032266"},{"product_id":"water-pump-impeller-kit-fits-yamaha-25-40-hp-outboard-motors-replaces-66t-w0078-00","title":"Water Pump Impeller Service Kit Without Housing – Yamaha T25, F30 \u0026 F40 4-Stroke Outboards, 2000–2009","description":"\u003cstyle\u003e\n .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n table.ss-table th, table.ss-table td {\n padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n }\n table.ss-table th {\n white-space:nowrap;\n word-break:normal;\n letter-spacing:normal;\n font-weight:600;\n background:#f8fafc;\n }\n @media (max-width:480px){\n table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n }\n\u003c\/style\u003e\n\u003csection\u003e\n \u003ch2\u003eProduct Details\u003c\/h2\u003e\n \u003cp\u003eThis \u003cstrong\u003eWater Pump Impeller Service Kit Without Housing\u003c\/strong\u003e is designed for Yamaha T25, F30, and F40 4-stroke outboard motors from model years 2000 through 2009. It provides the service components needed to renew the water pump and help restore dependable cooling-system performance.\u003c\/p\u003e\n \u003cp\u003eThe kit is supplied \u003cstrong\u003ewithout the main water pump housing\u003c\/strong\u003e. It is associated with Yamaha OEM reference \u003cstrong\u003e66T-W0078-00\u003c\/strong\u003e; the corresponding without-housing reference is commonly shown as \u003cstrong\u003e66T-W0078-00-00\u003c\/strong\u003e. Verify the exact model, year, and existing pump-housing configuration before ordering.\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003eDesigned for Yamaha T25, F30, and F40 4-stroke outboards, model years 2000–2009.\u003c\/li\u003e\n \u003cli\u003eService-kit configuration for replacing the impeller and related water-pump wear components.\u003c\/li\u003e\n \u003cli\u003eSupplied without the main water pump housing, making it suitable when the existing housing remains serviceable.\u003c\/li\u003e\n \u003cli\u003eIncludes the impeller, wear plate, key, insert cup, gasket, seals, cover, washers, and bolt set listed below.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003ePart Number References\u003c\/h2\u003e\n \u003cp\u003eThese references are provided to help compare the kit with the part removed from your outboard. They are not a substitute for checking the complete engine application.\u003c\/p\u003e\n \u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Part Number References\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand\u003c\/th\u003e\n \u003cth\u003eReference\u003c\/th\u003e\n \u003cth\u003eApplication\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-00\u003c\/td\u003e\n \u003ctd\u003eOEM water pump kit reference\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-00-00\u003c\/td\u003e\n \u003ctd\u003eWithout-housing reference\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSierra\u003c\/td\u003e\n \u003ctd\u003e18-3440\u003c\/td\u003e\n \u003ctd\u003eWithout-housing water pump kit reference\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n \u003cp\u003eCompany fitment identifies this service kit for Yamaha 4-stroke T25, F30, and F40 outboards manufactured from 2000 through 2009. Confirm the exact model designation and water-pump arrangement before installation.\u003c\/p\u003e\n \u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand\u003c\/th\u003e\n \u003cth\u003eModel Family\u003c\/th\u003e\n \u003cth\u003eRated HP\u003c\/th\u003e\n \u003cth\u003eStroke\u003c\/th\u003e\n \u003cth\u003eModel Years\u003c\/th\u003e\n \u003cth\u003ePrimary OEM Reference\u003c\/th\u003e\n \u003cth\u003eHousing\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eT25\u003c\/td\u003e\n \u003ctd\u003e25\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2000–2009\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-00\u003c\/td\u003e\n \u003ctd\u003eWithout main pump housing\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF30\u003c\/td\u003e\n \u003ctd\u003e30\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2000–2009\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-00\u003c\/td\u003e\n \u003ctd\u003eWithout main pump housing\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eYamaha\u003c\/td\u003e\n \u003ctd\u003eF40\u003c\/td\u003e\n \u003ctd\u003e40\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e2000–2009\u003c\/td\u003e\n \u003ctd\u003e66T-W0078-00\u003c\/td\u003e\n \u003ctd\u003eWithout main pump housing\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n \u003cdl\u003e\n \u003cdt\u003eProduct Type\u003c\/dt\u003e\n \u003cdd\u003eWater Pump Impeller Service Kit\u003c\/dd\u003e\n \u003cdt\u003eConfiguration\u003c\/dt\u003e\n \u003cdd\u003eWithout main water pump housing\u003c\/dd\u003e\n \u003cdt\u003eInstallation\u003c\/dt\u003e\n \u003cdd\u003eReplacement service kit for the existing water-pump assembly\u003c\/dd\u003e\n \u003cdt\u003ePrimary OEM Reference\u003c\/dt\u003e\n \u003cdd\u003e66T-W0078-00\u003c\/dd\u003e\n \u003cdt\u003eEngine Family\u003c\/dt\u003e\n \u003cdd\u003eYamaha T25, F30, and F40 4-stroke outboards\u003c\/dd\u003e\n \u003cdt\u003eModel Years\u003c\/dt\u003e\n \u003cdd\u003e2000–2009\u003c\/dd\u003e\n \u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n \u003cp\u003eThe kit includes service components for the water pump. The main water pump housing is not included.\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003e1 x Water pump case gasket\u003c\/li\u003e\n \u003cli\u003e1 x Water pump impeller\u003c\/li\u003e\n \u003cli\u003e1 x Impeller wear plate\u003c\/li\u003e\n \u003cli\u003e1 x Impeller key\u003c\/li\u003e\n \u003cli\u003e1 x Insert cup\u003c\/li\u003e\n \u003cli\u003e1 x Water pump housing cover\u003c\/li\u003e\n \u003cli\u003e1 x O-ring\u003c\/li\u003e\n \u003cli\u003e1 x Water seal\u003c\/li\u003e\n \u003cli\u003e1 x Bolt set containing 4 bolts\u003c\/li\u003e\n \u003cli\u003e4 x Bolt washers\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eNot included:\u003c\/strong\u003e the main water pump housing\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003cp\u003eComponent references commonly associated with this configuration include Yamaha OEM numbers 63D-44316-00-00, 6H4-44352-00-00, 66T-44323-00-00, 90280-03M03-00, 63D-44322-00-00, 90119-08M15-00, 63D-44312-00-00, 93210-59MG7-00, 663-44366-00-00, and 90209-08M02-00. Confirm the original parts and diagram for your exact engine before installation.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n \u003col\u003e\n \u003cli\u003eDisconnect the battery and place the outboard in neutral. Follow the engine service manual when removing the lower unit.\u003c\/li\u003e\n \u003cli\u003eSeparate the lower unit carefully, taking care around the shift shaft and water tube.\u003c\/li\u003e\n \u003cli\u003ePlace the lower unit on a stable work surface and remove the water-pump cover and retaining hardware.\u003c\/li\u003e\n \u003cli\u003eRemove the worn impeller, key, wear plate, insert cup, gasket, seals, and other service parts being replaced.\u003c\/li\u003e\n \u003cli\u003eInspect the existing main water pump housing. This kit does not include that housing; replace it separately if it is damaged, scored, warped, or excessively worn.\u003c\/li\u003e\n \u003cli\u003eClean all mating surfaces and remove old gasket material, corrosion, and debris.\u003c\/li\u003e\n \u003cli\u003eInstall the new gasket, wear plate, insert cup, seals, and cover components in the correct order for your engine.\u003c\/li\u003e\n \u003cli\u003eFit the impeller key into the driveshaft slot and install the impeller. Rotate the driveshaft in the direction specified by the service manual while seating the cover.\u003c\/li\u003e\n \u003cli\u003eInstall the washers and bolt set, then tighten the fasteners to the manufacturer’s specified torque.\u003c\/li\u003e\n \u003cli\u003eReinstall the lower unit, ensuring that the driveshaft, shift shaft, water tube, and locating components are correctly engaged.\u003c\/li\u003e\n \u003cli\u003eTest the outboard in water or with an appropriate flushing device. Confirm a steady tell-tale stream and monitor the engine for overheating.\u003c\/li\u003e\n \u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n \u003cdetails\u003e\u003csummary\u003eWhich Yamaha engines does this kit fit?\u003c\/summary\u003e\u003cp\u003eThe company fitment for this kit is Yamaha T25, F30, and F40 4-stroke outboards from 2000 through 2009. Match the exact model designation and year shown on your engine before ordering.\u003c\/p\u003e\u003c\/details\u003e\n \u003cdetails\u003e\u003csummary\u003eDoes this kit include the water pump housing?\u003c\/summary\u003e\u003cp\u003eNo. This is the without-housing configuration. It includes the listed water-pump service components but does not include the main water pump housing.\u003c\/p\u003e\u003c\/details\u003e\n \u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing impeller?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include a weak or intermittent tell-tale stream, overheating at idle, rising engine temperature, or a damaged impeller found during inspection. Sand, silt, salt, and extended storage can accelerate wear.\u003c\/p\u003e\u003c\/details\u003e\n \u003cdetails\u003e\u003csummary\u003eShould the existing housing be inspected?\u003c\/summary\u003e\u003cp\u003eYes. Because the housing is reused with this kit, inspect it for scoring, corrosion, distortion, cracks, or excessive wear. Replace it separately if it cannot provide a smooth sealing surface.\u003c\/p\u003e\u003c\/details\u003e\n \u003cdetails\u003e\u003csummary\u003eHow often should the impeller be replaced?\u003c\/summary\u003e\u003cp\u003eReplacement intervals depend on operating conditions, service history, and the engine manufacturer’s maintenance schedule. More frequent service may be needed after operation in sandy, silty, or saltwater environments.\u003c\/p\u003e\u003c\/details\u003e\n \u003cdetails\u003e\u003csummary\u003eDo I need special tools?\u003c\/summary\u003e\u003cp\u003eInstallation normally requires standard hand tools and a torque wrench. Always use the service manual for the correct fastener sequence, torque values, seal orientation, and impeller-rotation direction.\u003c\/p\u003e\u003c\/details\u003e\n \u003cdetails\u003e\u003csummary\u003eIs this an OEM Yamaha part?\u003c\/summary\u003e\u003cp\u003eThis listing is for a replacement service kit identified for the Yamaha OEM application shown above. It is not represented as a genuine Yamaha-branded component.\u003c\/p\u003e\u003c\/details\u003e\n \u003cdetails\u003e\u003csummary\u003eHow can I avoid ordering the wrong kit?\u003c\/summary\u003e\u003cp\u003eCompare the exact engine model, horsepower, stroke, model year, OEM reference, and whether your existing assembly uses the same housing and cover arrangement. Do not rely on horsepower alone.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003eVerify the exact engine model, year, stroke, and OEM reference before purchase.\u003c\/li\u003e\n \u003cli\u003eThis kit is for Yamaha T25, F30, and F40 4-stroke applications listed above; it is not identified for 2-stroke models.\u003c\/li\u003e\n \u003cli\u003eThe main water pump housing is not included. Inspect the original housing before reusing it.\u003c\/li\u003e\n \u003cli\u003eUse the manufacturer’s service information for torque specifications and installation procedures.\u003c\/li\u003e\n \u003cli\u003eProfessional installation is recommended if you are not experienced with outboard lower-unit or water-pump service.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003ePro-Grade Standards — We supply marine replacement parts selected for dependable service in real-world operating conditions.\u003c\/li\u003e\n \u003cli\u003eApplication-Focused Support — Product information is organized around engine model, horsepower, stroke, year, and part-number compatibility.\u003c\/li\u003e\n \u003cli\u003eManufacturer-Direct Value — Fair pricing with practical replacement solutions for routine marine maintenance.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723806609723,"sku":"17KY012","price":32.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/17KY0122_c5c9d9ad-10a5-42b2-a350-fcbd411b18ea.jpg?v=1763032268"}],"url":"https:\/\/seasierra.com\/collections\/yamaha-outboard-4-stroke-25-40hp-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}