{"product_id":"wossner-8562da-piston-kit-2003-2015-yamaha-wr450f-2003-2004-yz450f","title":"Wossner 8562DA Piston Kit - 2003-2015 Yamaha WR450F \/ 2003-2004 YZ450F","description":"\u003ch3\u003eWossner 8562DA Premium Series Forged 4-Stroke Piston Kit - Standard Size A\u003c\/h3\u003e\n\n\u003cp\u003eRevitalize the power of your Yamaha 450cc machine with the Wossner 8562DA Piston Kit. Engineered specifically for the iconic 2003-2015 Yamaha WR450F and 2003-2004 YZ450F platforms, this Premium Series forged kit is the professional choice for restoring \"Factory Quality\" performance. At Moto-House MX, we know these engines are the backbone of serious enduro and motocross riding; Wossner’s aerospace-grade forged components ensure your machine delivers reliable, consistent power in the toughest conditions.\u003c\/p\u003e\n\n\u003cp\u003eForged from aerospace-grade aluminum alloy, the 8562DA maintains a robust 12.5:1 compression ratio, providing excellent throttle response and bottom-end torque. Wossner incorporates advanced features like radial boss machining and enhanced oiling slots for superior wrist pin lubrication—essential for these high-displacement, high-heat 4-stroke engines. The permanent skirt coating minimizes internal friction and piston rock, resulting in a quieter engine and a more efficient break-in. This Standard Size A piston (94.96mm) is precision-matched for 95.00mm bores, perfect for an engine refresh that restores your Yamaha to its former glory.\u003c\/p\u003e\n\n\u003ch3\u003eTop Features: Wossner 8562DA Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eStandard Size A (94.96mm):\u003c\/b\u003e Precision-engineered for 95.00mm bores to maintain factory-spec clearances and maximum compression.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003e12.5:1 Compression Ratio:\u003c\/b\u003e Delivers the perfect balance of increased throttle response and long-term mechanical reliability.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003ePremium Series Forging:\u003c\/b\u003e Significantly stronger and more heat-resistant than OEM cast pistons, ideal for high-load enduro and motocross use.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eEnhanced Lubrication Design:\u003c\/b\u003e Radial boss machining and annular grooves ensure the wrist pin stays lubricated during sustained high-RPM operation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eLow-Friction Skirt Coating:\u003c\/b\u003e Reduces drag and mechanical noise while protecting your cylinder walls from premature wear.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eComplete Assembly:\u003c\/b\u003e Kit includes the forged piston, high-performance rings, wrist pin, and pin locks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eExpert Pro-Tip:\u003c\/b\u003e The Yamaha 450 engine is a powerhouse, but keeping the top end fresh is key to longevity. Size A is the ideal choice for a new or excellent-condition cylinder. When performing a rebuild with the 8562DA, we strongly recommend replacing your cam chain and performing a thorough valve check. Using a fresh top-end gasket kit will ensure a professional-grade seal, allowing you to get back to the trail or track with confidence.\u003c\/p\u003e\n\n\u003ch3\u003eFitment List\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" style=\"width: 100%; border-collapse: collapse;\"\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003eYear Range\u003c\/th\u003e\n            \u003cth\u003eVehicle Brand\u003c\/th\u003e\n            \u003cth\u003eVehicle Model\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e2003-2015\u003c\/td\u003e\n            \u003ctd\u003eYamaha\u003c\/td\u003e\n            \u003ctd\u003eWR450F\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e2003-2004\u003c\/td\u003e\n            \u003ctd\u003eYamaha\u003c\/td\u003e\n            \u003ctd\u003eYZ450F\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eQ: Is this a Standard Size piston?\u003c\/b\u003e\u003cbr\u003e\nA: Yes, this is the 94.96mm piston designed for the standard 95.00mm bore. It is the ideal choice for cylinders that are still within factory service limits.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Does this kit include the gasket set?\u003c\/b\u003e\u003cbr\u003e\nA: No, the kit includes the forged piston, rings, wrist pin, and locks. A complete top-end gasket set is sold separately and is essential for a professional engine rebuild.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Why choose Wossner for my Yamaha 450?\u003c\/b\u003e\u003cbr\u003e\nA: Wossner forged pistons are denser and stronger than stock cast parts. They are specifically designed to handle the thermal and mechanical stresses of high-performance racing more effectively, providing superior durability for your 450 engine.\u003c\/p\u003e\n\n\u003ch3\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eComplete Top End Gasket Set:\u003c\/b\u003e Ensure a professional, leak-free seal and proper engine compression.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eMotorex Cross Power 4T Oil:\u003c\/b\u003e Premium synthetic lubrication specifically designed for high-performance 4-stroke engines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eRestore your machine’s power and precision today. Buy now at Moto-House MX!\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eMoto-House MX – Choice of Champions\u003c\/b\u003e – is located in Clermont\/Montverde, FL. The Best Motocross\/UTV \u0026amp; ATV Shop in Central Florida. Stop by our local store in Montverde, FL or enjoy lightning-fast shipping across the USA.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"Wossner 8562DA Piston Kit\",\n  \"image\": [],\n  \"description\": \"Premium Wossner 8562DA Forged 4-Stroke Piston Kit for 2003-2015 Yamaha WR450F and 2003-2004 YZ450F. 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