{"product_id":"6s5-12121-00-00-exhaust-valve-for-yamaha-252s-1800-2021-2023","title":"6S5-12121-00-00 Exhaust Valve for Yamaha 252S 1800 2021-2023","description":"\u003ch2\u003eExhaust Valve for Yamaha\u003c\/h2\u003e\u003cp\u003eThis exhaust valve, part number 6S5-12121-00-00, controls exhaust gas flow from the combustion chamber to the exhaust port, and it is a direct-fit replacement component for Yamaha marine engines.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis exhaust valve is a critical engine component that seals and releases exhaust gases during the combustion cycle. Built to OEM specifications and carrying the 6S5-12121-00-00 part number, it delivers reliable sealing and heat resistance for Yamaha marine engines. It suits boat owners and marine mechanics performing top-end rebuilds or routine valve service.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePrecision-ground valve face for a tight seal against the valve seat\u003c\/li\u003e\n\u003cli\u003eHeat-resistant alloy construction withstands high exhaust temperatures\u003c\/li\u003e\n\u003cli\u003eChrome-plated stem reduces friction and wear in the valve guide\u003c\/li\u003e\n\u003cli\u003eDirect cross-reference to OEM part number 6S5-12121-00-00\u003c\/li\u003e\n\u003cli\u003eHardened tip resists mushrooming from rocker arm contact\u003c\/li\u003e\n\u003cli\u003eManufactured to factory dimensions for drop-in fitment\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\u003cli\u003efor Yamaha 252S 1800 (2021-2023)\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end engine rebuilds on Yamaha 252S 1800 boats\u003c\/li\u003e\n\u003cli\u003eRoutine valve inspection and replacement during service intervals\u003c\/li\u003e\n\u003cli\u003eMarine engine repair shops handling Yamaha jet boat powerplants\u003c\/li\u003e\n\u003cli\u003eRestoring compression and exhaust flow after valve burnout\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6S5-12121-00-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eComponent Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eExhaust Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Engine\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYamaha 1800\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e252S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel Years\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2021-2023\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Should exhaust valves be replaced in sets? \u003cstrong\u003eA:\u003c\/strong\u003e Replacing all valves in the affected cylinder head at once is common practice, since wear tends to be even across the set. Check valve guides and seats at the same time for best results.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does this valve require lapping after installation? \u003cstrong\u003eA:\u003c\/strong\u003e Verify seat contact and adjust valve clearance to factory specification after installation. Lapping may be needed if the seat shows any pitting or uneven wear.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":51065644679254,"sku":"OO1C08311","price":50.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_96da2726-2f6d-41f0-8efe-870b451c2b50.jpg?v=1794394705","url":"https:\/\/www.solidspare.com\/products\/6s5-12121-00-00-exhaust-valve-for-yamaha-252s-1800-2021-2023","provider":"Solid Spare","version":"1.0","type":"link"}