{"product_id":"wossner-8630da-piston-kit-2006-2009-yamaha-yz450f-2013-2015-gas-gas-ec-450f-size-a","title":"Wossner 8630DA Piston Kit - 2006-2009 Yamaha YZ450F \/ 2013-2015 Gas Gas EC 450F Size A","description":"\u003ch3\u003eWossner 8630DA Standard Series Forged 4-Stroke Piston Kit - Standard Size A\u003c\/h3\u003e\n\n\u003cp\u003eRefresh your engine’s reliability and power with the Wossner 8630DA Piston Kit. Specifically engineered for the 2006-2009 Yamaha YZ450F and the 2013-2015 Gas Gas EC 450F, this Standard Series forged kit is the professional choice for restoring \"Factory Quality\" performance. At Moto-House MX, we know these 5-valve and early 4-valve Yamaha-based platforms are legendary for their durability; Wossner’s aerospace-grade forged components provide the precision fitment needed to keep these workhorses charging on the track or trail.\u003c\/p\u003e\n\n\u003cp\u003eForged from aerospace-grade aluminum alloy, the 8630DA maintains a reliable 12.3:1 compression ratio, providing smooth, consistent power delivery and excellent heat resistance. Wossner incorporates advanced features like radial boss machining and enhanced oiling slots for superior wrist pin lubrication—a critical upgrade for high-displacement 4-stroke engines operating under heavy loads. The permanent skirt coating minimizes internal friction and piston rock, resulting in a quieter running engine and a more efficient break-in period. This Standard Size A piston (94.96mm) is precision-matched for 95.00mm bores, perfect for a top-end refresh that restores your machine to its original factory tolerances.\u003c\/p\u003e\n\n\u003ch3\u003eTop Features: Wossner 8630DA 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 engine life.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003e12.3:1 Compression Ratio:\u003c\/b\u003e Matches original performance specifications for reliable power and compatibility with premium pump fuel.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eStandard Series Forging:\u003c\/b\u003e Significantly stronger and more durable than OEM cast pistons, ideal for the high-impact stress of motocross and off-road racing.\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 intense, high-RPM operation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eLow-Friction Skirt Coating:\u003c\/b\u003e Permanent coating reduces drag and protects 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 2006-2009 YZ450F is famous for its robust engine, but peak performance requires maintaining tight tolerances. Size A is the ideal choice for a cylinder that is still within factory service limits. When performing a rebuild with the 8630DA, we recommend inspecting your valve train and replacing the cam chain to ensure total engine harmony. Always use a fresh top-end gasket kit and high-quality synthetic oil to provide a professional-grade seal and protect your new forged assembly.\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\u003e2006-2009\u003c\/td\u003e\n            \u003ctd\u003eYamaha\u003c\/td\u003e\n            \u003ctd\u003eYZ450F\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e2013-2015\u003c\/td\u003e\n            \u003ctd\u003eGas Gas\u003c\/td\u003e\n            \u003ctd\u003eEC 450F\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 correct choice for cylinders that are new, freshly replated, or within original factory 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 required for a professional engine rebuild.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Why choose Wossner for my Yamaha or Gas Gas?\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.\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 8630DA Piston Kit\",\n  \"image\": [],\n  \"description\": \"Premium Wossner 8630DA Forged 4-Stroke Piston Kit for 2006-2009 Yamaha YZ450F and 2013-2015 Gas Gas EC 450F. 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