{"title":"Yamaha 3-250HP 2-Stroke Outboard Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px;border:1px solid #e5e7eb;border-radius:8px;max-width:1100px;margin:0 auto 20px auto;\"\u003e\n  \u003cp\u003e\n    This page is dedicated to Yamaha 2‑Stroke 3–250 HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, commonly replaced items, and troubleshooting guidance. You can also browse the main Yamaha collection. Scroll to the bottom of this page to start browsing parts for this engine. On the collection page, use the Filter \u0026amp; Sort controls to narrow results by horsepower, year range, and part category\/section.\n  \u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-outboard-parts\" style=\"display:inline-block;padding:10px 14px;background:#0f766e;color:#fff;text-decoration:none;border-radius:6px;\"\u003eBrowse All Yamaha Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"max-width:1100px;margin:0 auto 24px auto;\"\u003e\n  \u003ch2\u003eHow to Identify Your 3–250 HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNameplate\/serial location:\u003c\/strong\u003e Look on the transom bracket or swivel bracket for the model\/serial plate. It lists the model code, serial number, and often shaft length.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReading the model code:\u003c\/strong\u003e Yamaha 2‑Stroke codes typically include horsepower and suffixes for shaft length (S\/L\/XL), starting type, and control type. The final characters often indicate year revision.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePlatform clues:\u003c\/strong\u003e Small portables (3–8 HP) are single‑cylinder; midrange 9.9–90 HP are usually inline‑2\/3 carbureted; 115–130 HP are V4; 150–250 HP are V6. Many mid\/large 2‑Strokes use oil‑injection; small models may be pre‑mix.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e2‑Stroke specifics:\u003c\/strong\u003e Verify whether your engine is pre‑mix (typical 50:1) or oil‑injected, as this affects service parts and procedures.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"platforms\" style=\"max-width:1100px;margin:0 auto 24px auto;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n\n  \u003ch3\u003ePortable Single‑Cylinder (3–8 HP 2‑Stroke)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\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\u003eSingle‑cylinder carbureted 2‑Stroke; tiller steer; manual start common.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e3–8 HP 2‑Stroke portable series (short\/long shaft variants).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eVery light, simple to service, easy portability.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eOften pre‑mix fuel\/oil. Check prop\/hub size and shaft length before ordering propellers.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eMidrange Inline‑2\/3 Carbureted (9.9–90 HP 2‑Stroke)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\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‑2 or inline‑3 carbureted 2‑Stroke; remote or tiller controls.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e9.9\/15\/25\/40\/50\/60\/70\/75\/85\/90 HP 2‑Stroke families.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eStrong power‑to‑weight, straightforward ignition and fuel systems.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eSome models are oil‑injected. Verify gearcase type (standard vs. high‑thrust) when selecting props and seals.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eV4 (115–130 HP 2‑Stroke)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\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\u003eV4 carbureted\/oil‑injected 2‑Stroke.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e115–130 HP 2‑Stroke V4 series.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eBroad mid‑range torque and proven reliability.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eUse the correct water pump kit and prop hub components for V4 gearcases; many parts differ from inline engines.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eV6 (150–250 HP 2‑Stroke)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\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\u003eV6 oil‑injected carbureted\/EFI 2‑Stroke (model‑dependent); remote controls.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e150\/175\/200\/225\/250 HP 2‑Stroke V6 series.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eHigh output, strong holeshot, widely supported service parts.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eV6 uses specific water pump kits, anodes, and prop hubs. Confirm shaft length and gear ratio when choosing propellers.\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=\"max-width:1100px;margin:0 auto 24px auto;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for typical recreational use. Always follow the procedures and schedules in your official Yamaha service manual.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\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\u003eChange more often if water intrusion or heavy use. Inspect magnetic drain plug for metal.\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 every 50 hours; replace ~100 hours\u003c\/td\u003e\n        \u003ctd\u003eUse correct heat range\/gap for your model. Fouling indicates rich mixture or oiling issues.\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 \/ water separator\u003c\/td\u003e\n        \u003ctd\u003eInspect every 50 hours; replace ~100 hours\u003c\/td\u003e\n        \u003ctd\u003eDrain\/replace sooner if contaminated fuel is suspected.\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 water or weak tell‑tale. Replace full kit if wear is evident.\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 \u0026amp; external)\u003c\/td\u003e\n        \u003ctd\u003eInspect every 50 hours; replace as needed\u003c\/td\u003e\n        \u003ctd\u003eUse correct material for your water (zinc\/brackish, aluminum\/brackish, magnesium\/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\u003eOil‑injection system (if equipped)\u003c\/td\u003e\n        \u003ctd\u003eCheck each season\u003c\/td\u003e\n        \u003ctd\u003eInspect tank, lines, strainer, and pump operation; purge air after service. Pre‑mix models: verify correct ratio.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-outboard-parts\"\u003eYamaha Outboard Parts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eFuel lines, primer bulb \u0026amp; connectors\u003c\/td\u003e\n        \u003ctd\u003eInspect each season\u003c\/td\u003e\n        \u003ctd\u003eCheck for softening\/cracks; replace ethanol‑damaged hoses and worn connectors.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-connector\"\u003eFuel Connectors\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003ePropeller \u0026amp; hub hardware\u003c\/td\u003e\n        \u003ctd\u003eInspect every 50 hours\u003c\/td\u003e\n        \u003ctd\u003eRemove\/grease shaft, check for fishing line at seals; confirm correct hub kit.\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  \u003cp style=\"font-size:12px;color:#4b5563;\"\u003e*Intervals are typical for recreational use; adjust for commercial\/heavy service or severe environments.\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"max-width:1100px;margin:0 auto 24px auto;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service Kits – \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 (Filters) – \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System (Pumps) – \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-pumps\"\u003eFuel Pumps\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\u003eCorrosion Protection – \u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-anodes\"\u003eYamaha Anodes\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropellers \u0026amp; Hardware – \u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-propellers\"\u003eYamaha Propellers\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"max-width:1100px;margin:0 auto 24px auto;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eWeak tell‑tale stream or overheat alarm\u003c\/td\u003e\n        \u003ctd\u003eInspect intake screens, thermostat, and water pump condition\u003c\/td\u003e\n        \u003ctd\u003eWater pump kit, thermostat, intake screen\/strainer\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd\u003eCheck prop condition\/pitch, fuel filter restriction, spark plug fouling\u003c\/td\u003e\n        \u003ctd\u003ePropeller\/hub kit, fuel filter, spark plugs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd\u003eVerify primer bulb, choke\/enrichment function, plug gap and condition\u003c\/td\u003e\n        \u003ctd\u003ePrimer bulb\/lines, spark plugs, fuel connectors\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eExcessive smoke (2‑Stroke)\u003c\/td\u003e\n        \u003ctd\u003eConfirm pre‑mix ratio or oil‑injection operation; look for stuck choke\u003c\/td\u003e\n        \u003ctd\u003eOil‑injection components, choke\/enrichment parts, spark plugs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGearcase noise \/ metal in gear oil\u003c\/td\u003e\n        \u003ctd\u003eInspect prop for fishing line at seals; change gear oil and check for water\u003c\/td\u003e\n        \u003ctd\u003eLower unit seals, prop hub components, gear oil service items\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=\"max-width:1100px;margin:0 auto 24px auto;\"\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\u003eNot always. Many items differ between portable, inline, V4, and V6 platforms and by year\/shaft length. Confirm your full model code, serial, and gearcase type before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should the impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eAs a rule of thumb, replace the impeller every 2 seasons or ~200 hours, sooner if the tell‑tale weakens, you run in sandy water, or the pump shows wear. Consider the full kit when the housing\/plate is worn.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I change lower unit gear oil?\u003c\/summary\u003e\n    \u003cp\u003eTypically every 100 hours or annually. Inspect immediately if you notice milky oil (water intrusion) or metal on the drain plug.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide the model code, serial number, shaft length, control type, and any visible casting numbers on the part. Photos of the nameplate and the old part help ensure a correct match.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px;border:1px solid #e5e7eb;border-radius:8px;max-width:1100px;margin:0 auto 28px auto;\"\u003e\n  \u003cp\u003eReady to find parts by horsepower, year, and model? Browse the main Yamaha outboard collection and use the filters to narrow down to your engine.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-outboard-parts\" style=\"display:inline-block;margin-top:8px;padding:10px 14px;background:#0f766e;color:#fff;text-decoration:none;border-radius:6px;\"\u003eShop Yamaha Outboard Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:10px;font-size:12px;color:#4b5563;\"\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":"thermostat-50-c-fits-yamaha-2-stroke-3hp-250hp-outboards-replaces-6e5-12411-688-12411-10-6h3-12411","title":"50°C Thermostat for Yamaha 2-Stroke Outboards – 25N, 30D, 40V, 225G, 250A\/B","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 50°C (122°F) replacement thermostat is designed for specified Yamaha 2-stroke outboard applications. It helps regulate engine operating temperature within the intended cooling-system range and is listed for Yamaha models including the 25N from 1994 onward, 30D, 40V, 225G, 250A, and 250B.\u003c\/p\u003e\n  \u003cp\u003eThe thermostat is identified by Yamaha OEM reference \u003cstrong\u003e6E5-12411-30\u003c\/strong\u003e and supersedes \u003cstrong\u003e688-12411-10\u003c\/strong\u003e and \u003cstrong\u003e688-12411-11\u003c\/strong\u003e. Confirm the complete engine model and year before ordering, because thermostat fitment can vary between otherwise similar outboards.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e50°C (122°F) operating temperature rating.\u003c\/li\u003e\n    \u003cli\u003eReplacement thermostat for specified Yamaha 2-stroke outboards.\u003c\/li\u003e\n    \u003cli\u003eUse the model and year information below together with your engine service information to confirm fitment.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eThese are the documented manufacturer references for this thermostat.\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\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\u003e6E5-12411-30\u003c\/td\u003e\n          \u003ctd\u003eCurrent listed reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e688-12411-10\u003c\/td\u003e\n          \u003ctd\u003eSuperseded reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e688-12411-11\u003c\/td\u003e\n          \u003ctd\u003eSuperseded 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\u003eThe company fitment record identifies the following Yamaha two-stroke applications. Model, year, horsepower, and stroke conditions should be treated together when checking compatibility.\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\u003c\/th\u003e\n          \u003cth\u003eRated HP\u003c\/th\u003e\n          \u003cth\u003eStroke\u003c\/th\u003e\n          \u003cth\u003eYear condition\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\u003e25N\u003c\/td\u003e\n          \u003ctd\u003e25 HP\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1994 onward\u003c\/td\u003e\n          \u003ctd\u003e6E5-12411-30\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e30D\u003c\/td\u003e\n          \u003ctd\u003e30 HP\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003eVerify engine year\u003c\/td\u003e\n          \u003ctd\u003e6E5-12411-30\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e40V\u003c\/td\u003e\n          \u003ctd\u003e40 HP\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003eVerify engine year\u003c\/td\u003e\n          \u003ctd\u003e6E5-12411-30\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e225G\u003c\/td\u003e\n          \u003ctd\u003e225 HP\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003eVerify engine year\u003c\/td\u003e\n          \u003ctd\u003e6E5-12411-30\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e250A\u003c\/td\u003e\n          \u003ctd\u003e250 HP\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003eVerify engine year\u003c\/td\u003e\n          \u003ctd\u003e6E5-12411-30\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e250B\u003c\/td\u003e\n          \u003ctd\u003e250 HP\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003eVerify engine year\u003c\/td\u003e\n          \u003ctd\u003e6E5-12411-30\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n  \u003cp\u003eDo not assume compatibility with other Yamaha, Parsun, Makara, or non-Yamaha engines solely because the horsepower or thermostat temperature is similar. Check the full model designation and compare the original thermostat reference before ordering.\u003c\/p\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\u003eThermostat\u003c\/dd\u003e\n    \u003cdt\u003eApplication\u003c\/dt\u003e\n    \u003cdd\u003eSpecified Yamaha 2-stroke outboard engines\u003c\/dd\u003e\n    \u003cdt\u003eOperating Temperature\u003c\/dt\u003e\n    \u003cdd\u003e50°C (122°F)\u003c\/dd\u003e\n    \u003cdt\u003ePrimary OEM Reference\u003c\/dt\u003e\n    \u003cdd\u003e6E5-12411-30\u003c\/dd\u003e\n    \u003cdt\u003eSuperseded References\u003c\/dt\u003e\n    \u003cdd\u003e688-12411-10 and 688-12411-11\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  \u003cul\u003e\n    \u003cli\u003e1 x 50°C thermostat\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eA thermostat housing gasket is not listed as included with this product. Inspect the existing gasket and replace it if required by the service procedure or if it is damaged.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eMake sure the outboard is stopped, completely cool, and safely secured before beginning work.\u003c\/li\u003e\n    \u003cli\u003eDisconnect the battery or follow the isolation procedure specified in the engine service manual.\u003c\/li\u003e\n    \u003cli\u003eLocate the thermostat housing and place a suitable drain pan beneath the work area.\u003c\/li\u003e\n    \u003cli\u003eRemove the housing cover carefully and retain the fasteners in their original positions.\u003c\/li\u003e\n    \u003cli\u003eRemove the existing thermostat and note its orientation before installation.\u003c\/li\u003e\n    \u003cli\u003eClean the housing and cover mating surfaces without damaging them.\u003c\/li\u003e\n    \u003cli\u003eInstall the new thermostat in the same orientation as the original part.\u003c\/li\u003e\n    \u003cli\u003eInstall a suitable new housing gasket if required; the gasket is not included with this thermostat.\u003c\/li\u003e\n    \u003cli\u003eReinstall the cover and tighten the fasteners to the torque specified in the service manual.\u003c\/li\u003e\n    \u003cli\u003eRun the engine using the correct water-supply procedure, check for leaks, and confirm normal cooling-system operation before returning the outboard to service.\u003c\/li\u003e\n  \u003c\/ol\u003e\n  \u003cp\u003eInstallation procedures and torque specifications vary by engine model. Use the applicable Yamaha service manual when servicing the thermostat.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat temperature is this thermostat rated for?\u003c\/summary\u003e\n    \u003cp\u003eThis thermostat is rated for 50°C (122°F).\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhich Yamaha engines are listed for this thermostat?\u003c\/summary\u003e\n    \u003cp\u003eThe company fitment record lists Yamaha 2-stroke models 25N from 1994 onward, 30D, 40V, 225G, 250A, and 250B. Confirm the complete model and year before installation.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes this thermostat include a housing gasket?\u003c\/summary\u003e\n    \u003cp\u003eNo housing gasket is listed as included. Inspect the old gasket and replace it when required by the service manual or when the gasket is damaged.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use a different temperature-rated thermostat?\u003c\/summary\u003e\n    \u003cp\u003eUse the temperature rating specified for your exact engine. Installing a thermostat with a different rating may affect engine temperature regulation and should not be done without confirmation from the applicable service information.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow can I confirm fitment before ordering?\u003c\/summary\u003e\n    \u003cp\u003eCompare your complete engine model and year with the compatibility table, then compare the thermostat reference on your original part or in the service manual. Do not rely on horsepower alone.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAllow the engine to cool completely before removing the thermostat housing.\u003c\/li\u003e\n    \u003cli\u003eFollow the service manual for cooling-system, water-supply, torque, and gasket procedures.\u003c\/li\u003e\n    \u003cli\u003eVerify the complete engine model and year before purchase.\u003c\/li\u003e\n    \u003cli\u003eIf the original part or housing differs, stop and confirm compatibility before installation.\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\u003eWe provide marine replacement parts with fitment information organized around the applicable engine model and service requirements.\u003c\/li\u003e\n    \u003cli\u003eFor the best result, compare the original part reference and full engine identification before ordering.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723966976315,"sku":"24TH502","price":26.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/24TH502_1_e75bbef1-e1d8-4dc4-9d9d-7966c0b5be98.jpg?v=1763038657"},{"product_id":"thermostat-fits-yamaha-2-stroke-outboards-3-250-hp-replaces-yamaha-6e5-12411-02-00-sierra-18-3540","title":"Yamaha Outboard Thermostat, 50°C (122°F) – 2-Stroke 3–250 HP and F15C\/F20BF 4-Stroke Applications","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\u003e50°C (122°F) thermostat\u003c\/strong\u003e is designed for selected Yamaha outboard applications, including Yamaha 2-stroke models from 3 HP through 250 HP and selected Yamaha 4-stroke F15C and F20BF models. It helps regulate engine operating temperature by opening at the specified 50°C rating.\u003c\/p\u003e\n  \u003cp\u003eThe thermostat is supplied with the applicable seal or gasket for the listed application. It is not an OEM Yamaha component; use the reference numbers and exact model information below to confirm compatibility before ordering.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e50°C (122°F) opening temperature.\u003c\/li\u003e\n    \u003cli\u003eAftermarket replacement thermostat for selected Yamaha outboard cooling systems.\u003c\/li\u003e\n    \u003cli\u003eApplications include both specific 2-stroke and selected 4-stroke Yamaha models.\u003c\/li\u003e\n    \u003cli\u003eSeal or thermostat-cover gasket included according to the applicable reference application.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eReference Part Numbers\u003c\/h2\u003e\n  \u003cp\u003eThe following manufacturer and aftermarket references are associated with the applications listed for this product. Part-number relationships can vary by engine model, year, and serial range, so confirm the complete engine specification before installation.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Reference Part Numbers\"\u003e\n      \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eReference\u003c\/th\u003e\n\u003cth\u003eApplication note\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e6E5-12411-02\u003c\/td\u003e\n\u003ctd\u003eSelected small-outboard and 2-stroke applications; supersedes 6E5-12411-00 and 6E5-12411-01.\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3623\u003c\/td\u003e\n\u003ctd\u003eAftermarket thermostat reference; seal included.\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e6E5-12411-30\u003c\/td\u003e\n\u003ctd\u003eSelected 2-stroke applications; supersedes 688-12411-10 and 688-12411-11.\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3540\u003c\/td\u003e\n\u003ctd\u003eAftermarket thermostat reference; gasket included for the applicable installation.\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e6H3-12411-11\u003c\/td\u003e\n\u003ctd\u003eSelected 50G, 60F, and 70B 2-stroke applications.\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3622\u003c\/td\u003e\n\u003ctd\u003eAftermarket reference associated with the 50G, 60F, and 70B applications.\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e6AH-12411-00\u003c\/td\u003e\n\u003ctd\u003eSelected 4-stroke F15C and F20BF applications.\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\u003eCompatibility is grouped by the specific Yamaha application records associated with this thermostat. Do not rely on horsepower alone; verify the exact model and the original thermostat reference.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Engine Compatibility\"\u003e\n      \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel or model group\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eReference\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e3A \/ Malta, 4A, 4B, 5C, 6C, 6D, 8C, 20D, E25A, 25B, E25B, 25J, 25N, 25V, 30D, 30G, 30H, E30H, 40X, E40X\u003c\/td\u003e\n\u003ctd\u003e3–40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e6E5-12411-02; Sierra 18-3623\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e3, 4, 5, 6, 8\u003c\/td\u003e\n\u003ctd\u003e3–8\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e6E5-12411-02; Sierra 18-3623\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eC30\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke, 1993 and newer\u003c\/td\u003e\n\u003ctd\u003e6E5-12411-02; Sierra 18-3623\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e9.9F, 15F, 25N, 30D, 40V, 75C, 90A, 100A, 115C, 130B, 150F, 175D, 200F, 200G, 225D, 225G, 250A, 250B\u003c\/td\u003e\n\u003ctd\u003e9.9–250\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e6E5-12411-30; Sierra 18-3540\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eZ150P, Z150Q, Z175G, Z200N, Z200P\u003c\/td\u003e\n\u003ctd\u003e150–200\u003c\/td\u003e\n\u003ctd\u003e2-Stroke HPDI\u003c\/td\u003e\n\u003ctd\u003e6E5-12411-30; Sierra 18-3540\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e50G, 60F, 70B\u003c\/td\u003e\n\u003ctd\u003e50–70\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e6H3-12411-11; Sierra 18-3622\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eF15C, F20BF\u003c\/td\u003e\n\u003ctd\u003e15–20\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e6AH-12411-00\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\u003eAftermarket outboard thermostat\u003c\/dd\u003e\n    \u003cdt\u003eOpening temperature\u003c\/dt\u003e\n\u003cdd\u003e50°C (122°F)\u003c\/dd\u003e\n    \u003cdt\u003ePrimary applications\u003c\/dt\u003e\n\u003cdd\u003eSelected Yamaha 2-stroke and 4-stroke outboards\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eReplacement installation in the original thermostat location\u003c\/dd\u003e\n    \u003cdt\u003eOEM status\u003c\/dt\u003e\n\u003cdd\u003eAftermarket replacement; not manufactured by Yamaha\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 50°C outboard thermostat\u003c\/li\u003e\n    \u003cli\u003e1 x applicable thermostat seal or cover gasket\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eAllow the engine to cool completely before beginning work.\u003c\/li\u003e\n    \u003cli\u003eConfirm that the replacement thermostat reference and engine application match your original part.\u003c\/li\u003e\n    \u003cli\u003eRemove the thermostat cover using the correct tools and retain the fasteners.\u003c\/li\u003e\n    \u003cli\u003eNote the orientation of the old thermostat before removing it.\u003c\/li\u003e\n    \u003cli\u003eClean the cover and mounting surfaces without damaging them.\u003c\/li\u003e\n    \u003cli\u003eInstall the thermostat and the supplied seal or gasket in the correct orientation.\u003c\/li\u003e\n    \u003cli\u003eReinstall the cover and tighten the fasteners to the engine manufacturer's specified torque.\u003c\/li\u003e\n    \u003cli\u003eRun the engine according to the manufacturer's procedure and check for leaks or abnormal temperature behavior.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\n  \u003ch2\u003eFAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat temperature does this thermostat open at?\u003c\/summary\u003e\n    \u003cp\u003eThis thermostat is specified to open at 50°C, equivalent to 122°F.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this an OEM Yamaha thermostat?\u003c\/summary\u003e\n    \u003cp\u003eNo. This is an aftermarket replacement intended for the listed Yamaha applications and reference numbers.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes the package include a seal or gasket?\u003c\/summary\u003e\n    \u003cp\u003eYes. The applicable seal or thermostat-cover gasket is included, as specified by the corresponding application record.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill this fit every Yamaha outboard from 3 to 250 HP?\u003c\/summary\u003e\n    \u003cp\u003eNo. The horsepower range summarizes multiple specific application groups. Confirm the exact model, stroke type, and original thermostat reference before purchasing.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I install it myself?\u003c\/summary\u003e\n    \u003cp\u003eInstallation may be suitable for an experienced DIY mechanic, but follow the engine manufacturer's service procedure and torque specifications. Professional installation is recommended if you are unsure of the correct application or installation method.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n  \u003ch2\u003eSafety and Compatibility Information\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify the complete engine model and stroke type before ordering.\u003c\/li\u003e\n    \u003cli\u003eDo not use horsepower alone to determine compatibility.\u003c\/li\u003e\n    \u003cli\u003eCompare the original thermostat and seal or gasket with the replacement before installation.\u003c\/li\u003e\n    \u003cli\u003eStop operation and inspect the cooling system if the engine overheats or shows abnormal temperature behavior.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cp\u003eSea Sierra supplies aftermarket marine replacement parts for maintenance and repair applications. Product fitment is based on the specific model and reference information provided above.\u003c\/p\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723967009083,"sku":"17TH050","price":24.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Outboard_Thermostat_for_Yamaha_2_Stroke_3-250_HP_Outboard_Motors__6E5-12411_-_JLM_MARINE-8286964.jpg?v=1763038658"}],"url":"https:\/\/seasierra.com\/collections\/yamaha-3-250hp-2-stroke-outboard-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}