{"product_id":"66m-12411-01-66m-12411-03-thermostat","title":"66M-12411-03 Yamaha Thermostat | Genuine OEM Yamaha Outboard Part","description":"\u003cp\u003e\n 🔧 Product Description\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n Genuine Yamaha Outboard Thermostat - Part Number: 66M-12411-03\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n A genuine Yamaha cooling-system thermostat for selected small and mid-range four-stroke outboards.\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n The thermostat regulates cooling-water flow according to engine temperature. The current Yamaha service family is commonly catalogued under 66M-12411-01, with the supplied 66M-12411-03 reference belonging to the same replacement family.\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n ⚙️ Key Features\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Genuine Yamaha OEM cooling-system thermostat\n\u003c\/p\u003e\n\u003cp\u003e\n • Supplied Yamaha reference 66M-12411-03\n\u003c\/p\u003e\n\u003cp\u003e\n • Current related Yamaha service reference 66M-12411-01\n\u003c\/p\u003e\n\u003cp\u003e\n • Regulates engine warm-up and operating temperature\n\u003c\/p\u003e\n\u003cp\u003e\n • Cross-references with Sierra, WSM and Mallory thermostats\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n 🔄 Supersession \u0026amp; Cross Reference\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n OEM Supersession Chain:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • 66M-12411-01 → Supersedes 66M-12411-00\n\u003c\/p\u003e\n\u003cp\u003e\n • 66M-12411-00 → Supersedes 6G8-12411-03\n\u003c\/p\u003e\n\u003cp\u003e\n • 6G8-12411-03 → Supersedes 6G8-12411-02\n\u003c\/p\u003e\n\u003cp\u003e\n • 6G8-12411-02 → Supersedes 6G8-12411-01\n\u003c\/p\u003e\n\u003cp\u003e\n • 6G8-12411-01 → Supersedes 6G8-12411-00\n\u003c\/p\u003e\n\u003cp\u003e\n • 66M-12411-03 related Yamaha thermostat service reference\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n OEM \/ Related Numbers:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • 66M-12411-03\n\u003c\/p\u003e\n\u003cp\u003e\n • 66M-12411-03-00\n\u003c\/p\u003e\n\u003cp\u003e\n • 66M-12411-01\n\u003c\/p\u003e\n\u003cp\u003e\n • 66M-12411-00\n\u003c\/p\u003e\n\u003cp\u003e\n • 6G8-12411-03\n\u003c\/p\u003e\n\u003cp\u003e\n • 6G8-12411-02\n\u003c\/p\u003e\n\u003cp\u003e\n • 6G8-12411-01\n\u003c\/p\u003e\n\u003cp\u003e\n • 6G8-12411-00\n\u003c\/p\u003e\n\u003cp\u003e\n • 6AH-12411-00\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n Aftermarket \/ Verified Equivalents:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Sierra: 18-3541\n\u003c\/p\u003e\n\u003cp\u003e\n • WSM: 775-205\n\u003c\/p\u003e\n\u003cp\u003e\n • Mallory: 9-43037\n\u003c\/p\u003e\n\u003cp\u003e\n • EMP: 75-75506\n\u003c\/p\u003e\n\u003cp\u003e\n • Aftermarket reference: 13012\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n 🚤 Compatibility\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n Commonly used on:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha portable and mid-range four-stroke cooling systems\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n Typically suits:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Engine models:\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F2.5\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F4, F4A and F4B\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F5A\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F6, F6A and F6C\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F8, F8C, F8F and T8\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F9.9, F9.9F, F9.9J and T9.9\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F15A, F15C, F15E, F15L and F15S\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F20A and F20B\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F25 and T25\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F30\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F40 and F40A\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F50 and T50\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F60 and T60\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F70\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F80\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F100 four-stroke applications using the 66M thermostat family\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • HP Range: 2.5HP - 100HP\n\u003c\/p\u003e\n\u003cp\u003e\n • Engine Type: Yamaha four-stroke outboard\n\u003c\/p\u003e\n\u003cp\u003e\n • Year Range: Approximately 1998 onward, dependent on cooling-system diagram\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n 🔌 Function\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n The thermostat restricts cooling flow while the engine warms and opens as operating temperature rises. This maintains correct combustion temperature while preventing overheating.\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n Common signs of failure:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Engine overheats because the thermostat remains closed\n\u003c\/p\u003e\n\u003cp\u003e\n • Engine runs excessively cold because the thermostat remains open\n\u003c\/p\u003e\n\u003cp\u003e\n • Poor idle quality or excessive fuel use during warm-up\n\u003c\/p\u003e\n\u003cp\u003e\n • Corrosion or salt deposits restrict thermostat movement\n\u003c\/p\u003e\n\u003cp\u003e\n • Engine temperature becomes unstable during operation\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n 📦 Condition\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Genuine Yamaha part\n\u003c\/p\u003e\n\u003cp\u003e\n • Brand new\n\u003c\/p\u003e\n\u003cp\u003e\n • Supplied in original or equivalent packaging\n\u003c\/p\u003e\n","brand":"Yamaha","offers":[{"title":"Default Title","offer_id":53405072785700,"sku":"349319G","price":95.7,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/8115\/7924\/files\/original_0e5cb9f6-dc87-4f43-8489-e3886f7c3d73.jpg?v=1777287134","url":"https:\/\/www.sawleysautoandmarine.com.au\/products\/66m-12411-01-66m-12411-03-thermostat","provider":"Sawley's Auto and Marine","version":"1.0","type":"link"}