{"product_id":"refresh-your-yamaha-125-2-stroke-engine-with-the-wossner-8302da-piston-kit-forged-standard-size-a-53-95mm-for-2005-2021-yz125-and-2020-2022-yz125x-shop-moto-house-mx","title":"Wossner 8302DA Piston Kit - 2005-2021 Yamaha YZ125 YZ125X Standard Size A","description":"\u003ch3\u003eWossner 8302DA Standard Series Forged 2-Stroke Piston Kit - Standard Size A\u003c\/h3\u003e\n\u003cp\u003eRestore the legendary high-RPM scream of your Yamaha 125 with the Wossner 8302DA Piston Kit. Precision-engineered for the 2005-2021 YZ125 and the 2020-2022 YZ125X, this Standard Size A forged kit is the premier choice for riders seeking a significant upgrade over stock cast pistons. At Moto-House MX, we know the YZ125 is the benchmark for 125cc performance; Wossner’s aerospace-grade forged construction ensures your engine can handle the heat and stress of wide-open throttle racing while providing a more durable foundation for your top end.\u003c\/p\u003e\n\u003cp\u003eForged from high-silicon aluminum alloy, the 8302DA utilizes a dual-ring design. This configuration is highly valued by off-road and motocross riders alike for its superior cylinder sealing and improved heat transfer to the cylinder walls, which helps prevent power fade during long motos or technical trail rides. To maximize the service life of your engine, Wossner applies a permanent molybdenum disulphide skirt coating that reduces friction and minimizes piston rock. Precision-machined for standard 54.00mm bores, this Size A (53.95mm) piston delivers the exact tolerances needed for a professional-grade engine refresh.\u003c\/p\u003e\n\u003ch3\u003eTop Features: Wossner 8302DA Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eStandard Size A (53.95mm):\u003c\/b\u003e Engineered specifically for factory 54.00mm bores to maintain the correct piston-to-wall clearance for peak efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDual Ring Configuration:\u003c\/b\u003e Provides an exceptional secondary seal and enhanced cooling, ensuring consistent power delivery throughout the RPM range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAerospace-Grade Forging:\u003c\/b\u003e Denser and stronger than OEM cast pistons, offering increased resistance to fatigue and high-heat expansion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eLow-Friction Skirt Coating:\u003c\/b\u003e A permanent molybdenum disulphide treatment reduces internal drag for a quieter, smoother running engine and extended cylinder life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOptimized Lightness:\u003c\/b\u003e Expertly machined to reduce reciprocating mass, helping the YZ125 retain its lightning-fast throttle response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eComplete Top-End Kit:\u003c\/b\u003e Includes the forged piston, high-performance rings, wrist pin, and circlips.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eExpert Pro-Tip:\u003c\/b\u003e The Yamaha YZ125 engine is a masterpiece of 2-stroke engineering, but it requires fresh top ends to stay competitive. Moving to a Wossner forged piston provides peace of mind when you're pushing the engine to its 11,000+ RPM limit. Size A is the correct choice for a new cylinder or one that still measures exactly at the factory 54.00mm bore size. When installing the 8302DA, always verify your ring end gap and use a fresh top-end gasket kit to ensure a perfect seal. Consistent use of high-quality 2-stroke oil will keep your new forged assembly protected for hours of track-shredding performance.\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\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\u003e2005-2021\u003c\/td\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYZ125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020-2022\u003c\/td\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYZ125X\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: Is this an upgrade over the stock Yamaha piston?\u003c\/b\u003e\u003cbr\u003eA: Yes. Wossner pistons are forged, which makes them more resilient to thermal stress and mechanical fatigue compared to the standard cast pistons found in many stock engines.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: When should I choose Size A?\u003c\/b\u003e\u003cbr\u003eA: Size A (53.95mm) is designed for a cylinder that is brand new or has very low hours and still measures at the factory 54.00mm bore. If your cylinder has significant wear, you should measure it to see if a Size B or C is required.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Does this kit fit the YZ125X cross-country model?\u003c\/b\u003e\u003cbr\u003eA: Yes, this kit is fully compatible with the 2020-2022 YZ125X as well as the standard YZ125 motocross models within the 2005-2021 range.\u003c\/p\u003e\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 leak-free rebuild with the correct base and head gaskets for your Yamaha.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMotul 800 2T Factory Line:\u003c\/b\u003e The ultimate 2-stroke lubricant to keep your new Wossner forged piston protected in high-RPM racing conditions.\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":44495995469907,"sku":"8302DA","price":132.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/2756525.png?v=1776229822","url":"https:\/\/motohousemx.com\/products\/refresh-your-yamaha-125-2-stroke-engine-with-the-wossner-8302da-piston-kit-forged-standard-size-a-53-95mm-for-2005-2021-yz125-and-2020-2022-yz125x-shop-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}