{"product_id":"sierra-18-3609-marine-thermostat-kit-for-yamaha-outboards-25-250-hp-replaces-yamaha-6e5-12411-30-00","title":"Sierra 18-3609 Thermostat Kit for Yamaha 2-Stroke Outboards, OEM 6J8-12414-A0-00, 60 Degrees C","description":"\u003cp\u003eThe Sierra 18-3609 Thermostat Kit is a complete cooling system replacement kit built for Yamaha 2-stroke outboard engines. Rather than sourcing a thermostat and gasket separately, this kit bundles both components so the cooling system can be serviced in a single step. It is engineered to meet or exceed the performance of the original equipment part it replaces, giving boat owners a dependable way to restore proper engine temperature regulation.\u003c\/p\u003e\u003cp\u003eInside the kit is one 18-3541 thermostat, cross-referenced to Yamaha OEM number 66M-12411-01-00, and one 18-0835 cover gasket, cross-referenced to Yamaha OEM number 62Y-12414-00-00. Together these components correspond to the Yamaha OEM kit equivalent 6J8-12414-A0-00. The thermostat is rated to open at 60 degrees C, matching the factory-specified opening temperature for the cooling systems this kit is designed to service.\u003c\/p\u003e\u003cp\u003eA worn or stuck thermostat is a common cause of an overheating outboard, and the included gasket ensures a proper seal is restored at the same time the thermostat is replaced, preventing coolant leaks and repeat labor. This kit is intended for Yamaha 2-stroke outboard cooling systems.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3609\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Thermostat Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating:\u003c\/strong\u003e 60 degrees C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e (1) 18-3541 Thermostat, (1) 18-0835 Cover Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermostat OEM Cross Reference:\u003c\/strong\u003e 66M-12411-01-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGasket OEM Cross Reference:\u003c\/strong\u003e 62Y-12414-00-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit OEM Cross Reference:\u003c\/strong\u003e 6J8-12414-A0-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Type:\u003c\/strong\u003e 2-Stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Yamaha Outboard Cooling System\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.09 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eYamaha 2-stroke outboard cooling systems\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e6J8-12414-A0-00\u003c\/li\u003e\n\u003cli\u003e66M-12411-01-00\u003c\/li\u003e\n\u003cli\u003e62Y-12414-00-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3609 thermostat kit include?\u003c\/strong\u003e The kit includes one 18-3541 thermostat and one 18-0835 cover gasket, giving you both parts needed to service a Yamaha 2-stroke outboard cooling system in a single purchase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature does the 18-3609 thermostat open at?\u003c\/strong\u003e The thermostat included in the Sierra 18-3609 kit is rated to open at 60 degrees C, which matches the factory cooling system specification it is designed to service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3609 an OEM-equivalent part?\u003c\/strong\u003e Yes. The Sierra 18-3609 kit cross-references to Yamaha OEM kit number 6J8-12414-A0-00, with the individual thermostat matching OEM number 66M-12411-01-00 and the gasket matching OEM number 62Y-12414-00-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines is the 18-3609 thermostat kit designed for?\u003c\/strong\u003e This kit is designed for Yamaha 2-stroke outboard cooling systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to replace the gasket along with the thermostat?\u003c\/strong\u003e Yes, replacing both together is recommended, which is why the 18-3609 kit bundles the 18-3541 thermostat with the 18-0835 cover gasket rather than selling the thermostat alone.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3609 thermostat kit weigh?\u003c\/strong\u003e The Sierra 18-3609 thermostat kit weighs 0.09 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-3609 kit replace?\u003c\/strong\u003e The 18-3609 kit corresponds to Yamaha OEM numbers 6J8-12414-A0-00 (kit), 66M-12411-01-00 (thermostat), and 62Y-12414-00-00 (gasket).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan a failed thermostat cause my outboard to overheat?\u003c\/strong\u003e A stuck or worn thermostat is a common cause of outboard overheating, which is why the 18-3609 kit is designed to restore correct temperature regulation with a fresh, properly rated 60 degree C thermostat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra manufacture this part to OEM standards?\u003c\/strong\u003e Sierra products, including the 18-3609 kit, are engineered to meet or exceed the performance of the original equipment part they replace.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3609 a two-stroke or four-stroke application?\u003c\/strong\u003e The Sierra 18-3609 thermostat kit is built for Yamaha 2-stroke outboard cooling systems.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988155150555,"sku":"SIE-18-3609","price":27.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3609_lg__60638.1558126140.500.750.jpg?v=1785188422","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3609-marine-thermostat-kit-for-yamaha-outboards-25-250-hp-replaces-yamaha-6e5-12411-30-00","provider":"Good Vibes Marina","version":"1.0","type":"link"}