{"title":"Yamaha 2-Stroke Outboard 5-300HP Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px 0;\"\u003e\n  \u003cp\u003eThis page supports Yamaha 2‑Stroke 5–300HP outboard engines. Use it to find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse our main Yamaha outboard collection. At the bottom of this page, follow the link to start browsing parts for this engine. On the collection page, use the Filter \u0026amp; Sort controls to narrow by horsepower, year range, and category.\u003c\/p\u003e\n  \u003cp\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-outboard-parts\" style=\"display:inline-block;padding:10px 16px;background:#0b5ed7;color:#fff;text-decoration:none;border-radius:6px;\"\u003eBrowse All Yamaha Outboard Parts\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:12px 0;\"\u003e\n  \u003ch2\u003eHow to Identify Your 5–300HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the ID plate on the transom\/clamp bracket or swivel bracket. It lists model code, serial number, and sometimes shaft length.\u003c\/li\u003e\n    \u003cli\u003eRead the model code: letters often indicate features (E = electric start, R = remote, T = power trim\/tilt) and shaft length (S\/L\/XL). A year\/production suffix may be included.\u003c\/li\u003e\n    \u003cli\u003eDetermine lubrication: many Yamaha 2‑strokes use oil injection (remote or under‑cowl tank); some small models are premix. Inspect for an oil tank\/cap and delivery lines.\u003c\/li\u003e\n    \u003cli\u003eNote platform differences for parts fit: portable single\/twin, inline‑3 midrange, V4, and V6 models can use different impellers, gearcases, and ignition components.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"platforms\" style=\"padding:12px 0;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n  \u003ch3\u003ePortable 2‑Stroke (5–25HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:940px;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\u003eSingle or twin‑cylinder carbureted 2‑Stroke; manual or electric start; tiller or remote options.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e5–25HP portable 2‑Stroke variants with short\/long shafts.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eLightweight, simple service, excellent for small boats and tenders.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eSome are premix; confirm fuel:oil ratio on the cowling decal. Impeller and prop sizes vary by gearcase.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eMidrange Inline‑3 (30–90HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:940px;border-collapse:collapse;margin-top:8px;\"\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 carbureted\/oil‑injected 2‑Stroke; common on 40\/50\/60\/70\/75\/90HP classes.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e30–90HP 2‑Stroke inline‑3 families (various shaft lengths and controls).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eGood power‑to‑weight, straightforward maintenance, widely supported parts.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eWater pump and anodes are routine service items; inline‑3 fuel systems benefit from clean filters and stabilized fuel.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eV4 (115–130HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:940px;border-collapse:collapse;margin-top:8px;\"\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\u003eV4 2‑Stroke with oil injection; carbureted fuel delivery.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e115–130HP V4 series across multiple shaft and control options.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eStrong mid‑range torque, versatile on bay and lake boats.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eConfirm thermostat specification and impeller kit by model code; gearcase and prop hubs vary.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eV6 (150–300HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:940px;border-collapse:collapse;margin-top:8px;\"\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\u003e60° V6 2‑Stroke; carbureted, EFI (OX66), or high‑pressure systems (HPDI) depending on year.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e150\/175\/200\/225\/250\/300HP 2‑Stroke V6 families in multiple shaft lengths.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eHigh output, proven durability when serviced on schedule.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eFuel filtration is critical; always match water pump kits, anodes, and gearcase seals to your exact model and shaft length.\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:12px 0;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for Yamaha 2‑Stroke outboards. Always follow the official service manual for your exact model and operating environment.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;max-width:980px;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\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd\u003eCheck for water or metal; replace gaskets on drain\/fill screws.\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\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd\u003eUse correct heat range and gap; 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 \/ water separator\u003c\/td\u003e\n        \u003ctd\u003eInspect every 50 hrs; replace 100 hrs\/season\u003c\/td\u003e\n        \u003ctd\u003eEssential for carb, EFI, and HPDI systems; drain water as required.\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 or full kit\u003c\/td\u003e\n        \u003ctd\u003e200 hrs or 2 years (sooner in sandy\/silty water)\u003c\/td\u003e\n        \u003ctd\u003eMonitor tell‑tale stream and overheat alarms.\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 (external\/internal)\u003c\/td\u003e\n        \u003ctd\u003eInspect often; replace when 50% depleted\u003c\/td\u003e\n        \u003ctd\u003eCritical in salt\/brackish water to prevent corrosion.\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\u003eThermostat(s)\u003c\/td\u003e\n        \u003ctd\u003eEvery 2 years or if over‑cool\/overheat\u003c\/td\u003e\n        \u003ctd\u003eReplace sticky or corroded thermostats to maintain proper temp.\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\u003eOil‑injection system service (if equipped)\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hrs\/season\u003c\/td\u003e\n        \u003ctd\u003eInspect\/flush tank screens, check lines for brittleness, bleed system after service.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/hoses\"\u003eHoses\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003ePremix ratio (if no oil injection)\u003c\/td\u003e\n        \u003ctd\u003eEvery refuel\u003c\/td\u003e\n        \u003ctd\u003eFollow cowling decal\/manual (commonly 50:1) and use marine‑grade TC‑W3 oil.\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\u003eGearcase seals (if water in oil)\u003c\/td\u003e\n        \u003ctd\u003eAs needed\u003c\/td\u003e\n        \u003ctd\u003ePressure\/vacuum test after seal replacement; re‑fill with fresh gear lube.\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\u003ePropeller\/hub inspection\u003c\/td\u003e\n        \u003ctd\u003eEvery 50–100 hrs\u003c\/td\u003e\n        \u003ctd\u003eRemove prop to check for fishing line; verify hub integrity and pitch suitability.\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:12px 0;\"\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 — \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\u003ePropellers \u0026amp; Hubs — \u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-propellers\"\u003eYamaha Propellers\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\u003eGearcase 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  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:12px 0;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;max-width:980px;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 tell‑tale or overheat alarm\u003c\/td\u003e\n        \u003ctd\u003eInspect intake screens for blockage, thermostat operation, and impeller condition; verify hose routing.\u003c\/td\u003e\n        \u003ctd\u003eWater pump kit, thermostat, intake screen, anodes\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd\u003eCheck prop damage or spun hub, fuel quality, clogged filters\/jets, throttle\/timing linkage.\u003c\/td\u003e\n        \u003ctd\u003ePropeller, fuel filters, spark plugs, carburetor components\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd\u003ePrime bulb firmness, spark strength, idle mixture\/carb cleanliness, cracked fuel lines or air leaks.\u003c\/td\u003e\n        \u003ctd\u003eSpark plugs, primer bulb\/fuel line, carburetor gaskets\/jets\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eExcessive smoke (2‑Stroke)\u003c\/td\u003e\n        \u003ctd\u003eConfirm premix ratio; verify oil‑injection settings and thermostat (cold running increases smoke).\u003c\/td\u003e\n        \u003ctd\u003eSpark plugs, thermostat, oil‑injection hoses\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n        \u003ctd\u003eCheck oil level\/condition, water intrusion, prop shaft straightness, and seal lips.\u003c\/td\u003e\n        \u003ctd\u003eGear lube, lower unit seal kit, bearings\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:12px 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\u003eNot always. Even within the same horsepower, portable, inline‑3, V4, and V6 platforms can use different cooling, ignition, and gearcase parts. Use your full model code, shaft length, and configuration to confirm fitment.\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, every 2 years or 200 hours. In sandy or silty water, or if the tell‑tale weakens, service sooner. Many owners install a complete pump kit during scheduled maintenance.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should gear oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eChange lower unit gear oil every 100 hours or annually. Always inspect for water contamination or metal, and replace drain\/fill gaskets 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\u003eProvide the model code, serial number, horsepower, shaft length (S\/L\/XL), control type (tiller\/remote), and any noted features (trim\/tilt, oil injection). Photos of the nameplate and current parts are also helpful.\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 the exact parts for your Yamaha 2‑Stroke outboard? Browse the main collection by horsepower, year, and model.\u003c\/p\u003e\n  \u003cp\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yamaha-outboard-parts\" style=\"display:inline-block;padding:10px 16px;background:#0b5ed7;color:#fff;text-decoration:none;border-radius:6px;\"\u003eShop Yamaha Outboard Parts\u003c\/a\u003e\u003c\/p\u003e\n  \u003cp style=\"font-size:0.95em;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":"thermostat-143-fits-johnson-evinrude-yamaha-outboard-motors-replaces-436195","title":"143°F Thermostat for Johnson\/Evinrude Outboards – Replaces 436195, 0436195","description":"\u003csection\u003e\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\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003e143°F (62°C) marine thermostat\u003c\/strong\u003e is an aftermarket replacement for selected Johnson\/Evinrude outboard cooling systems. It is intended for the applications listed below and replaces the specified original-equipment and aftermarket reference numbers.\u003c\/p\u003e\n\u003cp\u003eThe thermostat is designed to begin opening at approximately 143°F (62°C), helping the engine reach and maintain its intended operating temperature. Confirm the thermostat reference number and the complete engine application before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e143°F (62°C) opening temperature.\u003c\/li\u003e\n  \u003cli\u003eAftermarket replacement thermostat for selected Johnson\/Evinrude outboards.\u003c\/li\u003e\n  \u003cli\u003eApplication coverage includes selected 9.9–15 HP Big Bore, 40\/48\/50 HP, 3-cylinder, and 90° V4 engines.\u003c\/li\u003e\n  \u003cli\u003eThermostat only; no gasket or additional installation hardware is listed as included.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThe following numbers are reference identifiers associated with this replacement thermostat. Verify the number stamped on your original part or listed in your service information before purchase.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Thermostat Part Number Matrix\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand or Reference\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC \/ Johnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e436195\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC \/ Johnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e0436195\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e0777837\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra Marine\u003c\/td\u003e\n\u003ctd\u003e18-3561\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMallory Marine\u003c\/td\u003e\n\u003ctd\u003e9-43023\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e13150\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC reference\u003c\/td\u003e\n\u003ctd\u003eBRP8M6010304\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\n\u003cp\u003eCompany fitment information identifies the following application groups. Because compatibility can vary by model designation and production configuration, match the engine model, year, stroke, and existing thermostat reference whenever possible.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Johnson and Evinrude Engine Compatibility\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eApplication or Engine Group\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\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003eBig Bore outboards\u003c\/td\u003e\n\u003ctd\u003e9.9–15 HP\u003c\/td\u003e\n\u003ctd\u003eNot specified in company fitment\u003c\/td\u003e\n\u003ctd\u003e1996–2006\u003c\/td\u003e\n\u003ctd\u003e436195 \/ 0436195\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003eOutboard applications\u003c\/td\u003e\n\u003ctd\u003e40, 48, 50 HP\u003c\/td\u003e\n\u003ctd\u003eNot specified in company fitment\u003c\/td\u003e\n\u003ctd\u003e1995–2005\u003c\/td\u003e\n\u003ctd\u003e436195 \/ 0436195\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e3-cylinder outboards\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003eNot specified in company fitment\u003c\/td\u003e\n\u003ctd\u003e1993–2001\u003c\/td\u003e\n\u003ctd\u003e436195 \/ 0436195\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e90° V4 outboards\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003eNot specified in company fitment\u003c\/td\u003e\n\u003ctd\u003e1993–2001\u003c\/td\u003e\n\u003ctd\u003e436195 \/ 0436195\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eMarine engine thermostat\u003c\/dd\u003e\n  \u003cdt\u003eProduct Configuration\u003c\/dt\u003e\n\u003cdd\u003eSingle replacement thermostat\u003c\/dd\u003e\n  \u003cdt\u003eOpening Temperature\u003c\/dt\u003e\n\u003cdd\u003e143°F (62°C)\u003c\/dd\u003e\n  \u003cdt\u003eApplication Brand\u003c\/dt\u003e\n\u003cdd\u003eJohnson\/Evinrude outboard applications listed above\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eReplacement installation in the existing thermostat housing\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1 x\u003c\/span\u003e 143°F marine thermostat\u003c\/li\u003e\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included:\u003c\/strong\u003e A thermostat housing gasket, seals, or other installation hardware are not listed as included. Replace sealing components as required for your engine.\u003c\/p\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eRefer to the engine service information and allow the engine to cool completely before beginning work.\u003c\/li\u003e\n  \u003cli\u003eDisconnect the battery if required by the manufacturer's service procedure.\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 and note the orientation of the original thermostat.\u003c\/li\u003e\n  \u003cli\u003eRemove the old thermostat and clean loose corrosion or gasket material from the mating surfaces without damaging them.\u003c\/li\u003e\n  \u003cli\u003eInstall the replacement thermostat in the same orientation as the original part.\u003c\/li\u003e\n  \u003cli\u003eInstall a suitable new gasket or seal if required for your specific engine. The gasket is not listed as included with this product.\u003c\/li\u003e\n  \u003cli\u003eReinstall the housing cover and tighten the fasteners according to the engine manufacturer's specified procedure and torque.\u003c\/li\u003e\n  \u003cli\u003eRun the engine according to the service procedure and inspect the housing area for leaks while monitoring engine temperature.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I confirm this thermostat fits my engine?\u003c\/summary\u003e\u003cp\u003eFirst, compare the original thermostat reference with the Part Number Matrix. Then confirm the engine brand, model designation, horsepower, stroke, and production year against the application group shown above. If any of these details differ, consult the engine service information before ordering.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat thermostat temperature does this replacement use?\u003c\/summary\u003e\u003cp\u003eThis thermostat is specified to begin opening at approximately 143°F (62°C).\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are common signs of a thermostat problem?\u003c\/summary\u003e\u003cp\u003ePossible symptoms include overheating, unusually low operating temperature, slow warm-up, temperature alarms, or inconsistent temperature behavior. These symptoms can also be caused by other cooling-system problems, so inspect the complete system before replacing parts.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes this product include a gasket?\u003c\/summary\u003e\u003cp\u003eNo gasket is listed as included. Check the condition of the thermostat housing gasket or seal and replace it when required for a leak-free installation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM thermostat?\u003c\/summary\u003e\u003cp\u003eThis is an aftermarket replacement thermostat. The listed OEM and aftermarket numbers are provided as application references and replacement identifiers; verify fitment for your exact engine before installation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this a thermostat kit?\u003c\/summary\u003e\u003cp\u003eThis listing is for one replacement thermostat. A gasket and other installation components are not listed as included.\u003c\/p\u003e\u003c\/details\u003e\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eWork only on a fully cooled engine and follow the engine manufacturer's service procedures.\u003c\/li\u003e\n  \u003cli\u003eDo not rely on horsepower alone to confirm fitment; model, year, stroke, and engine configuration must also match.\u003c\/li\u003e\n  \u003cli\u003eInspect the cooling system for blockage, corrosion, leaks, and water-pump problems if the engine has experienced overheating.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when the correct procedure or torque specification is unavailable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — Practical replacement components for selected marine applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listings\u003c\/strong\u003e — Reference numbers and fitment details are provided to support correct part selection.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstallation Awareness\u003c\/strong\u003e — Always verify the complete engine application and replace related sealing components when required.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723966353723,"sku":"23TH623","price":20.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Thermostat_for_BRP_Johnson_Evinrude_143_degree_Outboard_436195__436195_-_JLM_MARINE-8291322.jpg?v=1763038626"}],"url":"https:\/\/seasierra.com\/collections\/yamaha-2-stroke-outboard-5-300hp-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}