{"product_id":"1sl-12121-00-exhaust-valve","title":"1SL-12121-00 Yamaha Exhaust Valve | 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 Exhaust Valve - Part Number: 1SL-12121-00-00\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n A genuine Yamaha exhaust valve used in Yamaha four-stroke cylinder head valve train assemblies where OEM part number 1SL-12121-00-00 is specified. This valve controls exhaust gas flow from the combustion chamber and is a critical sealing component for compression, combustion efficiency and engine performance.\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 exhaust valve\n\u003c\/p\u003e\n\u003cp\u003e\n • Correct Yamaha part number 1SL-12121-00-00\n\u003c\/p\u003e\n\u003cp\u003e\n • Exhaust-side cylinder head valve component\n\u003c\/p\u003e\n\u003cp\u003e\n • Designed for Yamaha four-stroke engine valve train assemblies\n\u003c\/p\u003e\n\u003cp\u003e\n • Precision valve face and stem design for correct sealing and heat transfer\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 • 1SL-12121-00-00 Yamaha exhaust valve reference\n\u003c\/p\u003e\n\u003cp\u003e\n • 1SL-12121-00 short Yamaha exhaust valve format\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 • 1SL-12121-00-00\n\u003c\/p\u003e\n\u003cp\u003e\n • 1SL-12121-00\n\u003c\/p\u003e\n\u003cp\u003e\n • 1SL121210000\n\u003c\/p\u003e\n\u003cp\u003e\n • 1SL1212100\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 • ProX: 28.2444-1\n\u003c\/p\u003e\n\u003cp\u003e\n • ProX titanium exhaust valve replacement family\n\u003c\/p\u003e\n\u003cp\u003e\n • Aftermarket reference: 1SL-12121-00\n\u003c\/p\u003e\n\u003cp\u003e\n • Aftermarket reference: 1SL1212100\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha 450 four-stroke exhaust valve replacement family where this OEM number is specified\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 four-stroke cylinder head valve train assemblies\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha exhaust valve applications where 1SL-12121-00-00 is specified by the parts diagram\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 YZ450F four-stroke valve applications where 1SL-12121-00-00 is specified\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha WR450F four-stroke valve applications where 1SL-12121-00-00 is specified\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha 450cc four-stroke cylinder head assemblies using the 1SL exhaust valve family\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha engine applications requiring OEM exhaust valve 1SL-12121-00-00\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Engine Type: Yamaha four-stroke engine\n\u003c\/p\u003e\n\u003cp\u003e\n • Valve Type: Exhaust valve\n\u003c\/p\u003e\n\u003cp\u003e\n • Year Range: model-specific Yamaha 1SL-series valve applications\n\u003c\/p\u003e\n\u003cp\u003e\n • Fitment Note: Match by OEM part number and engine parts diagram before installation\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 exhaust valve opens during the exhaust stroke to allow burnt gases to exit the combustion chamber, then closes to seal the cylinder during compression and combustion.\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 • Low compression\n\u003c\/p\u003e\n\u003cp\u003e\n • Hard starting\n\u003c\/p\u003e\n\u003cp\u003e\n • Poor idle quality\n\u003c\/p\u003e\n\u003cp\u003e\n • Misfire or loss of power\n\u003c\/p\u003e\n\u003cp\u003e\n • Excessive exhaust leakage\n\u003c\/p\u003e\n\u003cp\u003e\n • Burnt, pitted or warped valve face\n\u003c\/p\u003e\n\u003cp\u003e\n • Valve clearance repeatedly going out of specification\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":53404122218788,"sku":"9091068","price":222.01,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/8115\/7924\/files\/original_c9b6253b-1581-4776-8819-c50431b17209.jpg?v=1777285260","url":"https:\/\/www.sawleysautoandmarine.com.au\/products\/1sl-12121-00-exhaust-valve","provider":"Sawley's Auto and Marine","version":"1.0","type":"link"}