{"product_id":"6dr-14301-00-thermostat-for-yamaha-f9-9j-ft9-9l-t9-9mhb-jlm-marine","title":"6DR-14301-00 Thermostat for Yamaha F9.9J FT9.9L T9.9MHB | JLM Marine","description":"\u003ch2\u003eThermostat for Yamaha F9.9J FT9.9L T9.9MHB – Fits Yamaha 9.9HP Outboards\u003c\/h2\u003e\n\n\u003cp\u003eThis aftermarket thermostat is engineered to fit select Yamaha 9.9HP outboard models, including the F9.9J, FT9.9L, and T9.9MHB. It ensures proper engine temperature regulation for consistent performance and longevity.\u003c\/p\u003e\n\n\u003cp\u003eThis part directly replaces OEM part number \u003cstrong\u003e6DR-14301-00\u003c\/strong\u003e, providing a reliable and cost-effective solution for maintaining your outboard's cooling system.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eDirect replacement for Yamaha part number 6DR-14301-00\u003c\/li\u003e\n  \u003cli\u003eDesigned for Yamaha 9.9HP four-stroke outboards\u003c\/li\u003e\n  \u003cli\u003eEnsures optimal engine operating temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBrand\u003c\/th\u003e\n      \u003cth\u003ePart Number\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003e6DR-14301-00\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Yamaha owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-serial-number-guide-2025\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-parts-diagrams-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBrand\u003c\/th\u003e\n      \u003cth\u003eModel\u003c\/th\u003e\n      \u003cth\u003eOEM Part No.\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\u003eF9.9J\u003c\/td\u003e\n      \u003ctd\u003e6DR-14301-00\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003eFT9.9L\u003c\/td\u003e\n      \u003ctd\u003e6DR-14301-00\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003eT9.9MHB\u003c\/td\u003e\n      \u003ctd\u003e6DR-14301-00\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOEM Part Number\u003c\/td\u003e\n      \u003ctd\u003e6DR-14301-00\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eFits Brand\u003c\/td\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCompatible Models\u003c\/td\u003e\n      \u003ctd\u003eF9.9J, FT9.9L, T9.9MHB\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cspan style=\"color:red;\"\u003e1 x Thermostat (Part No. 6DR-14301-00)\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n  \u003cli\u003eEnsure the engine is completely cool before starting work. Disconnect the battery to prevent accidental starting.\u003c\/li\u003e\n  \u003cli\u003eDrain the cooling system and locate the thermostat housing on your engine. Consult your service manual for the exact location.\u003c\/li\u003e\n  \u003cli\u003eRemove the bolts securing the thermostat housing cover. Carefully lift the cover and remove the old thermostat.\u003c\/li\u003e\n  \u003cli\u003eClean the mating surfaces of the housing and cover thoroughly, removing all old gasket material and debris.\u003c\/li\u003e\n  \u003cli\u003eInstall the new thermostat in the correct orientation (spring side typically faces inward toward the engine). Ensure proper seating in the housing recess.\u003c\/li\u003e\n  \u003cli\u003eReplace the housing gasket or O-ring with a new one if available. Apply a thin coat of marine-grade sealant if recommended by the manufacturer.\u003c\/li\u003e\n  \u003cli\u003eReinstall the thermostat housing cover and torque bolts to manufacturer specifications in a criss-cross pattern.\u003c\/li\u003e\n  \u003cli\u003eRefill the cooling system with the appropriate coolant or allow water circulation to resume. Check for leaks around the housing.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery and start the engine. Monitor operating temperature to confirm proper thermostat function.\u003c\/li\u003e\n  \u003cli\u003eAllow the engine to reach normal operating temperature and verify no coolant leaks. Top off coolant if necessary.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this thermostat fits my Yamaha outboard?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify your engine model against the compatibility table above (F9.9J, FT9.9L, T9.9MHB). Cross-check your current thermostat's part number with 6DR-14301-00 or use the Yamaha parts diagrams linked in the Compatible Engine Models section.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my thermostat needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include engine overheating, running too cool (long warm-up times), inconsistent temperature readings, or coolant leaks near the thermostat housing. If your engine fails to reach normal operating temperature, the thermostat may be stuck open.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the thermostat on my Yamaha outboard?\u003c\/strong\u003e\u003cbr\u003e\nA: Yamaha recommends inspecting the thermostat during routine maintenance intervals (typically every 100 hours or annually). Replace it if you notice corrosion, failure to open\/close properly, or as part of cooling system service every 2–3 years depending on usage and water conditions.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I install this thermostat myself or do I need a professional?\u003c\/strong\u003e\u003cbr\u003e\nA: If you have basic mechanical skills and tools, thermostat replacement is straightforward. However, proper torque specifications and coolant handling are critical; professional installation is recommended if you're unfamiliar with outboard cooling systems.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM Yamaha part or an aftermarket replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n  \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51924872495417,"sku":"25CA076","price":85.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_08126a1c-ec56-445e-ba97-774cd779378f.jpg?v=1770528674","url":"https:\/\/jlmmarine.com\/es\/products\/6dr-14301-00-thermostat-for-yamaha-f9-9j-ft9-9l-t9-9mhb-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}