{"product_id":"wossner-8776db-piston-kit-2010-2013-yamaha-yz450f-size-b","title":"Wossner 8776DB Piston Kit - 2010-2013 Yamaha YZ450F Size B","description":"\u003ch3\u003eWossner 8776DB Premium Forged 4-Stroke Piston Kit - Size B\u003c\/h3\u003e\n\n\u003cp\u003eMaintain the aggressive power of your fuel-injected Yamaha with the Wossner 8776DB Piston Kit. Specifically engineered for the 2010-2013 Yamaha YZ450F, this Size B forged kit is the professional choice for restoring \"Factory Quality\" compression and reliability in seasoned cylinders. At Moto-House MX, we understand the demands of the YZ450F’s reverse-cylinder engine design, and Wossner’s aerospace-grade components are built to handle the intense heat and RPM of high-level motocross.\u003c\/p\u003e\n\n\u003cp\u003eForged from aerospace-grade aluminum alloy, this piston features advanced radial boss machining and enhanced oiling slots for superior wrist pin lubrication—a critical factor for the longevity of high-performance 450cc engines. The permanent skirt coating reduces internal friction and piston rock, resulting in a quieter-running engine and a faster break-in period. This Size B piston (96.97mm) is tailored for 97.01mm bores, providing the precise fitment needed for cylinders that have seen standard operational wear.\u003c\/p\u003e\n\n\u003ch3\u003eTop Features: Wossner 8776DB Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eStandard Size B (96.97mm Piston):\u003c\/b\u003e Precision-engineered for 97.01mm bores to maintain perfect factory-spec clearances in used cylinders.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eAerospace Forged Alloy:\u003c\/b\u003e Superior structural integrity and thermal resistance to withstand the mechanical stress of competitive racing.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eAdvanced Lubrication Design:\u003c\/b\u003e Radial boss machining and annular grooves ensure the wrist pin stays lubricated during high-RPM operation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eLow-Friction Skirt Coating:\u003c\/b\u003e Permanent coating minimizes mechanical noise and protects cylinder walls from excessive wear.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eEnhanced Ring Seal:\u003c\/b\u003e Specialized ring land treatment improves oil control and maximizes combustion efficiency.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eComplete Kit:\u003c\/b\u003e Includes 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 2010-2013 YZ450F was the first generation of Yamaha's rearward-slanted engine. Size B is the ideal selection for an engine refresh where the Nikasil cylinder plating is still in good condition but has experienced microscopic wear. When rebuilding your top end, always check your timing chain for stretch and ensure your valve clearances are within spec to complement your new high-compression forged piston.\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\u003e2010-2013\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: What is the difference between Size A and Size B?\u003c\/b\u003e\u003cbr\u003e\nA: Size B (96.97mm) is 0.01mm larger than Size A. This slight increase allows you to maintain the proper piston-to-wall clearance as the cylinder wall experiences natural wear over time, preventing \"piston slap\" and maintaining peak compression.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Does this kit include a gasket set?\u003c\/b\u003e\u003cbr\u003e\nA: No, the kit includes the piston, rings, wrist pin, and locks. A complete top-end gasket set is required for a professional rebuild and is sold separately.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Is the 12.5:1 compression ratio standard?\u003c\/b\u003e\u003cbr\u003e\nA: Yes, this ratio matches the factory specification for the 2010-2013 YZ450F, making it a reliable choice for both track and off-road use without requiring race fuel.\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 for your YZ450F rebuild.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eMotorex Cross Power 4T Oil:\u003c\/b\u003e Protect your new forged piston with high-performance synthetic lubrication.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eRestore your Yamaha’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 8776DB Piston Kit\",\n  \"image\": [],\n  \"description\": \"Premium Wossner 8776DB Forged 4-Stroke Piston Kit for 2010-2013 Yamaha YZ450F. 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