{"product_id":"wossner-8241db-piston-kit-ktm-65-sx-husqvarna-tc65-gas-gas-mc-65-size-b","title":"Wossner 8241DB Piston Kit - KTM 65 SX Husqvarna TC65 Gas Gas MC 65 Size B","description":"\u003ch3\u003eWossner 8241DB Premium Forged 2-Stroke Piston Kit - Size B\u003c\/h3\u003e\n\n\u003cp\u003eKeep your young racer at the front of the pack with the Wossner 8241DB Piston Kit. Specifically engineered for the high-revving 65cc engines found in the KTM 65 SX, Husqvarna TC65, and Gas Gas MC 65, this Size B forged kit is the professional choice for restoring Factory Quality power in cylinders that have seen standard operational wear. At Moto-House MX, we know that mini-cycle engines are pushed to their absolute limits; Wossner’s aerospace-grade forged alloy provides the structural integrity needed to handle the high heat and extreme RPMs of competitive motocross.\u003c\/p\u003e\n\n\u003cp\u003eForged from aerospace-grade aluminum alloy, the 8241DB offers superior strength and thermal resistance compared to standard cast pistons. This kit features a permanent skirt coating to minimize internal friction and piston rock, resulting in a quieter engine and more consistent power delivery. This Size B piston (44.97mm) is designed for cylinders with a 45.01mm bore, providing the precise fitment required to compensate for natural cylinder wear and maintain optimal compression.\u003c\/p\u003e\n\n\u003ch3\u003eTop Features: Wossner 8241DB Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eSize B (44.97mm):\u003c\/b\u003e Precision-engineered for 45.01mm bores to restore factory-spec tolerances in cylinders with slight wear.\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 65cc racing.\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\u003eSingle-Ring Racing Design:\u003c\/b\u003e Optimized for reduced drag and maximum high-RPM efficiency, a must for the 65cc class.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eComplete Assembly:\u003c\/b\u003e Kit includes the forged piston, high-quality ring, wrist pin, and clips.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eExpert Pro-Tip:\u003c\/b\u003e In the 65cc class, the piston is a high-maintenance item. Size B is the preferred choice for a top-end refresh when your cylinder is still in good condition but has worn slightly beyond the ideal clearance for a Size A piston. When installing the 8241DB, always replace your small-end wrist pin bearing and check your power valve for smooth operation. Using a fresh top-end gasket kit is essential for maintaining the primary compression needed for that signature 65cc \"hit.\"\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\u003eBrand\u003c\/th\u003e\n            \u003cth\u003eModels\u003c\/th\u003e\n            \u003cth\u003eYear Range\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cb\u003eKTM\u003c\/b\u003e\u003c\/td\u003e\n            \u003ctd\u003e65 SX\u003c\/td\u003e\n            \u003ctd\u003e2009-2025\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cb\u003eHusqvarna\u003c\/b\u003e\u003c\/td\u003e\n            \u003ctd\u003eTC65\u003c\/td\u003e\n            \u003ctd\u003e2017-2025\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cb\u003eGas Gas\u003c\/b\u003e\u003c\/td\u003e\n            \u003ctd\u003eMC 65\u003c\/td\u003e\n            \u003ctd\u003e2021-2025\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 (44.97mm) is 0.01mm larger than Size A. This slight increase is designed to compensate for the natural, microscopic wear that occurs on a cylinder wall over time, restoring the engine to original factory performance levels.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Why is a forged piston better for my child's 65cc bike?\u003c\/b\u003e\u003cbr\u003e\nA: 65cc engines are often ridden at maximum RPM constantly. Forged pistons are much denser and stronger than cast pistons, providing a significant safety margin against cracking or shattering under the extreme loads of racing.\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, ring, pin, and clips. We highly recommend purchasing a new high-quality small-end bearing separately for every top-end rebuild to ensure reliability.\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 2-stroke race 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 8241DB Piston Kit\",\n  \"image\": [],\n  \"description\": \"Premium Wossner 8241DB Forged 2-Stroke Piston Kit for KTM, Husqvarna, and Gas Gas 65cc models. 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