{"product_id":"wossner-8169db-piston-kit-ktm-250-sx-xc-husqvarna-tc-te-gas-gas-250-size-b","title":"Wossner 8169DB Piston Kit - KTM 250 SX\/XC Husqvarna TC\/TE Gas Gas 250 Size B","description":"\u003ch3\u003eWossner 8169DB Premium Forged 2-Stroke Piston Kit - Size B\u003c\/h3\u003e\n\u003cp\u003eMaintain the race-winning edge of your European 2-stroke with the Wossner 8169DB Piston Kit. Specifically engineered for KTM, Husqvarna, and Gas Gas 250cc cylinders that require a Size B fitment, this kit is the professional choice for restoring Factory Quality power and reliability. At Moto-House MX, we provide the high-performance forged components required to maintain peak compression in seasoned fuel-injected (TPI) and carbureted 250cc engines.\u003c\/p\u003e\n\u003cp\u003eForged from aerospace-grade aluminum alloy, this piston offers superior structural integrity and thermal resistance compared to standard cast alternatives. The permanent skirt coating is a critical feature, reducing internal friction and piston rock for a quieter engine and smoother throttle response. This Size B piston (66.35mm) is designed for cylinders with a 66.41mm bore, providing the precise clearances needed for optimal performance in cylinders that have seen standard use.\u003c\/p\u003e\n\u003ch3\u003eTop Features: Wossner 8169DB Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eStandard Size B (66.35mm):\u003c\/b\u003e Precision-engineered for 66.41mm bores to maintain perfect factory tolerances in used cylinders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAerospace Forged Alloy:\u003c\/b\u003e Premium aluminum construction for maximum durability and resistance to high-temperature fatigue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eLow-Friction Skirt Coating:\u003c\/b\u003e Permanent coating reduces wear and mechanical noise for a more efficient engine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDual-Ring Design:\u003c\/b\u003e Optimized for a consistent combustion seal and maximum compression across the powerband.\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\u003cp\u003e\u003cb\u003eExpert Pro-Tip:\u003c\/b\u003e Modern European 250cc cylinders are built with extremely high standards, but natural wear of the Nikasil plating occurs over time. Size B is the ideal selection for your second or third top-end refresh to compensate for this microscopic wear. When rebuilding TPI or carbureted models, always inspect your power valve for carbon buildup to ensure your powerband remains broad and predictable.\u003c\/p\u003e\n\u003ch3\u003eFitment List\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\" cellpadding=\"8\" border=\"1\"\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\u003e250 SX \/ XC \/ XC-W \/ EXC (Including TPI)\u003c\/td\u003e\n\u003ctd\u003e2005-2023\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eHusqvarna\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eTC250 \/ TE250 \/ TE250i\u003c\/td\u003e\n\u003ctd\u003e2014-2023\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 250 \/ EX 250 \/ EC 250\u003c\/td\u003e\n\u003ctd\u003e2021-2025\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eKTM\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eFreeride 250 R\u003c\/td\u003e\n\u003ctd\u003e2014-2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\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\u003eA: Size B (66.35mm) 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 piston slap and maintaining compression.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Does this kit work with TPI (Transfer Port Injection) models?\u003c\/b\u003e\u003cbr\u003eA: Yes, this forged piston is fully compatible with both carbureted and TPI fuel-injected 250cc engines from KTM, Husqvarna, and Gas Gas.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Does this kit include the wrist pin bearing?\u003c\/b\u003e\u003cbr\u003eA: No, the kit includes the piston, rings, pin, and clips. We highly recommend purchasing a new small-end bearing separately whenever you perform a top-end refresh.\u003c\/p\u003e\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 The recommended synthetic lubrication for high-performance European 2-strokes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRestore your machine’s power and precision today. Buy now at Moto-House MX!\u003c\/p\u003e\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\u003cp\u003e \u003c\/p\u003e","brand":"WOSSNER","offers":[{"title":"Default Title","offer_id":44496003137619,"sku":"8169DB","price":152.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/59666.png?v=1776230375","url":"https:\/\/motohousemx.com\/products\/wossner-8169db-piston-kit-ktm-250-sx-xc-husqvarna-tc-te-gas-gas-250-size-b","provider":"Moto-House MX","version":"1.0","type":"link"}