{"product_id":"wossner-8216da-piston-kit-1999-2026-yamaha-yz250-yz250x-2-stroke","title":"Wossner 8216DA Piston Kit - 1999-2026 Yamaha YZ250 \/ YZ250X 2-Stroke","description":"\u003ch3\u003eWossner 8216DA Premium Forged 2-Stroke Piston Kit - Standard Size A\u003c\/h3\u003e\n\n\u003cp\u003eMaintain the legendary \"hit\" of your Yamaha 2-stroke with the Wossner 8216DA Piston Kit. Specifically engineered for the Yamaha YZ250 and the woods-focused YZ250X, this Standard Size A forged kit is the professional choice for restoring Factory Quality power and reliability. At Moto-House MX, we know that the YZ250 engine is one of the most versatile platforms in motocross history, and Wossner’s aerospace-grade components ensure it stays at peak performance on the track or the trail.\u003c\/p\u003e\n\n\u003cp\u003eForged from aerospace-grade aluminum alloy, this piston provides superior structural integrity and thermal resistance compared to standard cast pistons. The 8216DA features a permanent skirt coating to reduce internal friction and piston rock, resulting in a quieter engine and smoother throttle response. With optimized machining for lightness and reinforced strength in the crown, this dual-ring piston is built to handle the intense heat and mechanical stress of competitive 250cc racing.\u003c\/p\u003e\n\n\u003ch3\u003eTop Features: Wossner 8216DA Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eStandard Size A (66.35mm Piston):\u003c\/b\u003e Precision-engineered for the standard 66.40mm bore to restore original factory tolerances and compression.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eAerospace Forged Alloy:\u003c\/b\u003e Premium aluminum construction provides maximum durability for high-performance 250cc 2-stroke engines.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eLow-Friction Skirt Coating:\u003c\/b\u003e Permanent coating reduces wear on cylinder walls and ensures a more efficient break-in period.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eDual-Ring Design:\u003c\/b\u003e Offers a superior combustion seal and improved heat dissipation for consistent power throughout your moto.\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 has remained a favorite for decades due to its reliability and broad powerband. When installing the 8216DA, always check your cylinder for any signs of glazing or wear in the Nikasil plating. Replacing your small-end wrist pin bearing and using a fresh top-end gasket kit during installation is essential for maintaining the high-RPM reliability Yamaha owners expect.\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: Is this a Standard Size piston?\u003c\/b\u003e\u003cbr\u003e\nA: Yes, this is the 66.35mm piston designed for the standard 66.40mm bore. It is the ideal choice for new cylinders or those in excellent condition with minimal wear.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Will this fit both the YZ250 and the YZ250X?\u003c\/b\u003e\u003cbr\u003e\nA: Yes, while the YZ250X has different head volume and power valve timing, it utilizes the same bore size and piston configuration as the standard YZ250 motocross model.\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 high-quality small-end bearing separately for every top-end rebuild.\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.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eMotorex Cross Power 2T Oil:\u003c\/b\u003e Premium synthetic lubrication to protect your new forged piston investment.\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 8216DA Piston Kit\",\n  \"image\": [],\n  \"description\": \"Premium Wossner 8216DA Forged 2-Stroke Piston Kit for 1999-2026 Yamaha YZ250 and YZ250X. Standard Size A (66.35mm) for 66.40mm bore. 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