{"product_id":"thermostat-50-c-122-f-fits-yamaha-4-stroke-2-5-70-hp-replaces-6g8-12411-00-69m-12411-00-01","title":"Thermostat 50°C\/122°F – Fits Yamaha 4-Stroke 2.5–70 HP (Replaces 6G8-12411-00, 69M-12411-00\/01)","description":"\u003cstyle\u003e\n\/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n.ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\/* Base table styles *\/\ntable.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\ntable.ss-table th, table.ss-table td { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n\/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\ntable.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n\/* Small screen optimization *\/\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 is a replacement \u003cstrong\u003eThermostat 50°C\/122°F – Fits Yamaha 4-Stroke 2.5–70 HP Outboards\u003c\/strong\u003e, designed to regulate engine temperature for optimal performance and longevity. It is engineered for a broad range of Yamaha 4-Stroke marine engines from 2.5 HP to 70 HP, covering models from 1987 to the present, including popular series like F2.5, F9.9, F15, and F20.\u003c\/p\u003e\n  \u003cp\u003eThis part serves as a direct interchange for Yamaha part numbers 6G8-12411-00, 69M-12411-00, 69M-12411-01, 6AH-12411-00, and Sierra 18-3624.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Designed for OEM direct replacement.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e Opens at 50°C (122°F) to maintain correct engine temperature.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMaterials:\u003c\/strong\u003e Constructed from a corrosion-resistant alloy for durability in marine environments.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\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\u003ePart Number\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\u003e6G8-12411-00\u003c\/td\u003e\n          \u003ctd\u003ePrimary OEM part number for many models.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e69M-12411-00\u003c\/td\u003e\n          \u003ctd\u003eSuperseded by 69M-12411-01.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e69M-12411-01\u003c\/td\u003e\n          \u003ctd\u003eOEM replacement.\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\u003eOEM replacement.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSierra\u003c\/td\u003e\n          \u003ctd\u003e18-3624\u003c\/td\u003e\n          \u003ctd\u003eAftermarket cross-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\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n  \u003cp\u003eThis thermostat is compatible with a wide array of Yamaha 4-stroke outboard engines. Verify your model and year against the list to ensure proper fitment.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; 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\u003eYears\u003c\/th\u003e\n          \u003cth\u003eOEM Part No.\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\u003eF2.5MSH-0405, F2.5MSH-0406, F2.5MSH-0407, F2.5MSH0608, F2.5MSHD-2005\u003c\/td\u003e\n          \u003ctd\u003e2.5\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e2003–2004\u003c\/td\u003e\n          \u003ctd\u003e69M-12411-01\u003c\/td\u003e\n          \u003ctd\u003eSuperseded 69M-12411-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF2.5MSHB\u003c\/td\u003e\n          \u003ctd\u003e2.5\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e2003\u003c\/td\u003e\n          \u003ctd\u003e69M-12411-01\u003c\/td\u003e\n          \u003ctd\u003eSuperseded 69M-12411-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF2.5MSHC\u003c\/td\u003e\n          \u003ctd\u003e2.5\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e2004\u003c\/td\u003e\n          \u003ctd\u003e69M-12411-01\u003c\/td\u003e\n          \u003ctd\u003eSuperseded 69M-12411-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF9.9H (6CA)\u003c\/td\u003e\n          \u003ctd\u003e9.9\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e2009 and newer\u003c\/td\u003e\n          \u003ctd\u003e6G8-12411-00\u003c\/td\u003e\n          \u003ctd\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF15C (6AG)\u003c\/td\u003e\n          \u003ctd\u003e15\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e2007 and newer\u003c\/td\u003e\n          \u003ctd\u003e6G8-12411-00\u003c\/td\u003e\n          \u003ctd\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF20B (6AH)\u003c\/td\u003e\n          \u003ctd\u003e20\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e2007 and newer\u003c\/td\u003e\n          \u003ctd\u003e6G8-12411-00\u003c\/td\u003e\n          \u003ctd\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eVarious 4-stroke models\u003c\/td\u003e\n          \u003ctd\u003e9.9–70\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1987–present\u003c\/td\u003e\n          \u003ctd\u003e6G8-12411-00\u003c\/td\u003e\n          \u003ctd\u003eGeneral compatibility\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\u003eOutboard Engine Thermostat\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eOEM Direct Replacement\u003c\/dd\u003e\n    \u003cdt\u003eOpening Temperature\u003c\/dt\u003e\n\u003cdd\u003e50°C (122°F)\u003c\/dd\u003e\n    \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eCorrosion-resistant alloy\u003c\/dd\u003e\n    \u003cdt\u003eTechnical Attributes\u003c\/dt\u003e\n\u003cdd\u003ePrecision-engineered sealing components\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 Outboard Thermostat (50°C \/ 122°F)\u003c\/li\u003e\n    \u003cli\u003e1 x Gasket (Replaces 62Y-12414-00)\u003c\/li\u003e\n    \u003cli\u003e1 x O-ring\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eEnsure the engine is cool and disconnect the battery for safety.\u003c\/li\u003e\n    \u003cli\u003eLocate the thermostat housing on the engine block. Place a container underneath to catch any residual coolant.\u003c\/li\u003e\n    \u003cli\u003eCarefully remove the bolts securing the thermostat cover. Note their positions if they are different lengths.\u003c\/li\u003e\n    \u003cli\u003eRemove the old thermostat and gasket. Take note of the thermostat's orientation.\u003c\/li\u003e\n    \u003cli\u003eClean both the housing and cover surfaces thoroughly, removing all old gasket material and corrosion.\u003c\/li\u003e\n    \u003cli\u003eInstall the new thermostat in the correct orientation, followed by the new gasket\/o-ring.\u003c\/li\u003e\n    \u003cli\u003eSecurely refasten the thermostat cover, tightening bolts to the manufacturer's specified torque in a crisscross pattern.\u003c\/li\u003e\n    \u003cli\u003eReconnect the battery, start the engine, and check for any leaks around the housing as the engine warms up.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know if my thermostat needs replacing?\u003c\/summary\u003e\n    \u003cp\u003eCommon signs of a faulty thermostat include the engine overheating at low speeds, or conversely, the engine failing to reach its normal operating temperature after sufficient warmup time. An inaccurate temperature gauge reading can also be an indicator.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill this fit my specific Yamaha F-series outboard?\u003c\/summary\u003e\n    \u003cp\u003eThis thermostat is designed for a wide range of Yamaha 4-stroke models. Please consult the \"Engine \u0026amp; Model Compatibility\" table and cross-reference your engine's model and year. For absolute certainty, check the part number stamped on your original thermostat.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the difference between 6G8-12411-00 and 69M-12411-01?\u003c\/summary\u003e\n    \u003cp\u003eThese part numbers are often interchangeable, with 69M-12411-01 typically superseding the older 69M-12411-00. Both are functionally equivalent to 6G8-12411-00 in many applications. Always verify the correct part number for your specific engine serial number if in doubt.\u003c\/p\u003e\n  \u003c\/details\u003e\n    \u003cdetails\u003e\n    \u003csummary\u003eAre gaskets or O-rings included with the thermostat?\u003c\/summary\u003e\n    \u003cp\u003eThis kit includes one thermostat, one gasket, and one o-ring. However, it is always a good practice to verify the contents upon arrival and have a spare gasket on hand, as a perfect seal is critical for preventing leaks.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n    \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n    \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n    \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n  \u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n    \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723791929659,"sku":"23TH014","price":21.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Thermostat_for_Yamaha_4_Stroke_F_99_to_70_HP_Outboard_Motor_6G8-12411-00_______69M-12411-00_-_JLM_MARINE-8291092.jpg?v=1763031899","url":"https:\/\/seasierra.com\/products\/thermostat-50-c-122-f-fits-yamaha-4-stroke-2-5-70-hp-replaces-6g8-12411-00-69m-12411-00-01","provider":"SeaSierra","version":"1.0","type":"link"}