{"product_id":"wossner-8216db-piston-kit-1999-2026-yamaha-yz250-yz250x-size-b","title":"Wossner 8216DB Piston Kit - 1999-2026 Yamaha YZ250 \/ YZ250X Size B","description":"\u003ch3\u003eWossner 8216DB Premium Forged 2-Stroke Piston Kit - Size B\u003c\/h3\u003e\n\n\u003cp\u003eKeep your Yamaha 2-stroke running at peak potential with the Wossner 8216DB Piston Kit. Specifically engineered for the Yamaha YZ250 and the cross-country YZ250X, this Size B forged kit is the professional choice for restoring Factory Quality power in seasoned cylinders. At Moto-House MX, we know the YZ250 is a legend of reliability and performance; Wossner’s aerospace-grade forged components provide the extra durability needed for competitive motocross and grueling off-road racing.\u003c\/p\u003e\n\n\u003cp\u003eForged from aerospace-grade aluminum alloy, this piston offers superior structural integrity and heat resistance compared to standard cast alternatives. The 8216DB features a permanent skirt coating to minimize friction and piston rock, ensuring a quieter engine and smoother throttle response. This Size B piston (66.36mm) is precision-matched for cylinders with a 66.41mm bore, providing the exact clearances required for optimal compression and power delivery in used cylinders.\u003c\/p\u003e\n\n\u003ch3\u003eTop Features: Wossner 8216DB Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eStandard Size B (66.36mm):\u003c\/b\u003e Precision-engineered for 66.41mm bores to maintain perfect factory-spec tolerances in used cylinders.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eAerospace Forged Alloy:\u003c\/b\u003e High-strength aluminum construction built to withstand the mechanical stress of high-RPM 2-stroke racing.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eLow-Friction Skirt Coating:\u003c\/b\u003e Permanent coating reduces wear on the cylinder walls and provides a quieter engine operation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eDual-Ring Design:\u003c\/b\u003e Optimized for a consistent combustion seal and improved heat transfer for sustained power throughout your ride.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eComplete Assembly:\u003c\/b\u003e Kit includes the forged piston, high-quality rings, wrist pin, and clips.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eExpert Pro-Tip:\u003c\/b\u003e The Yamaha YZ250 engine is a masterpiece of design, but even the best Nikasil cylinders experience microscopic wear over time. Size B is the ideal choice for a mid-life engine refresh, as it compensates for that wear to prevent piston slap and maintain maximum compression. When rebuilding, always inspect your power valve for carbon buildup and replace your small-end bearing to ensure a professional-grade top-end service.\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\u003e1999-2026\u003c\/td\u003e\n            \u003ctd\u003eYamaha\u003c\/td\u003e\n            \u003ctd\u003eYZ250\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e2016-2026\u003c\/td\u003e\n            \u003ctd\u003eYamaha\u003c\/td\u003e\n            \u003ctd\u003eYZ250X\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 (66.36mm) is exactly 0.01mm larger than Size A. This slight increase allows you to maintain the factory-specified piston-to-wall clearance as the cylinder wall experiences natural wear over time, preventing power loss and ensuring a quieter engine.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Does this fit the YZ250X woods model?\u003c\/b\u003e\u003cbr\u003e\nA: Yes, the YZ250X uses the same bore and piston configuration as the YZ250 motocross model, making this kit a perfect fit for both machines.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Does this kit include the wrist pin bearing?\u003c\/b\u003e\u003cbr\u003e\nA: No, the kit includes the piston, rings, pin, and clips. We highly recommend purchasing a new small-end bearing separately for every top-end rebuild to prevent premature failure.\u003c\/p\u003e\n\n\u003ch3\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eTop End Gasket Kit:\u003c\/b\u003e Essential for a professional, leak-free engine rebuild with a fresh set of gaskets.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eMotorex Cross Power 2T Oil:\u003c\/b\u003e Premium synthetic protection specifically formulated for high-performance 250cc 2-strokes.\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 8216DB Piston Kit\",\n  \"image\": [],\n  \"description\": \"Premium Wossner 8216DB Forged 2-Stroke Piston Kit for 1999-2026 Yamaha YZ250 and YZ250X. Size B (66.36mm) for 66.41mm bore. 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