{"product_id":"wossner-8957da-14-0-1-piston-kit-76-96-mm-yamaha-yz250f-2019-2025","title":"Wossner 8957DA 14.0:1 Piston Kit 76.96 mm | Yamaha YZ250F 2019-2025","description":"\u003cp\u003eRestore lost power and ensure your engine stays at the front of the pack with the \u003cstrong\u003eWossner 8957DA Premium Series Piston Kit.\u003c\/strong\u003e Engineered specifically for high-performance Yamaha 250cc four-strokes, this kit offers a\u003cstrong\u003e precision-fit 76.96mm bore and a crisp 14.0:1\u003c\/strong\u003e compression ratio. At Moto-House MX, we know that \u003cstrong\u003eRacing Performance\u003c\/strong\u003e isn't just a buzzword—it's the difference between a podium finish and a DNF, which is why we only stock components that meet professional standards.\u003c\/p\u003e\n\u003cp\u003eWossner utilizes a signature double-bridge forging process and a specialized 3D crown design to handle the extreme heat and pressure of modern motocross racing. These pistons feature skirt coatings for reduced friction and enhanced piston pin oiling slots to ensure maximum lubrication under load. This lightweight, forged aluminum alloy construction allows for tighter wall clearances, resulting in a quieter, smoother-running engine with superior ring seal and oil control.\u003c\/p\u003e\n\u003ch3\u003eTop Features: Wossner 8957DA Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble Bridge Forging:\u003c\/strong\u003e Advanced structural design for maximum strength and minimal weight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e14.0:1 Compression Ratio:\u003c\/strong\u003e Optimized for high-output 4-stroke performance and throttle response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkirt Coating:\u003c\/strong\u003e Specialized treatment to reduce friction and accelerate the break-in process.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Lubrication:\u003c\/strong\u003e Radial boss machining and annular grooves for superior wrist pin oiling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e Includes the 76.96mm piston, ring set, wrist pin, and retaining clips for a full top-end refresh.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment List\u003c\/h3\u003e\n\u003ctable border=\"1\" style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"padding: 8px; text-align: left;\"\u003eYear Range\u003c\/th\u003e\n\u003cth style=\"padding: 8px; text-align: left;\"\u003eVehicle Brand\u003c\/th\u003e\n\u003cth style=\"padding: 8px; text-align: left;\"\u003eVehicle Model \u0026amp; Size\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e2019-2025\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eYamaha\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eYZ250F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e2020-2025\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eYamaha\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eYZ250FX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e2020-2025\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eYamaha\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eWR250F\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\u003cstrong\u003eIs this an OEM replacement or a performance upgrade?\u003c\/strong\u003e\u003cbr\u003eWhile it serves as a direct-fit replacement, the Wossner 8957DA is a forged performance upgrade that offers better durability and tighter tolerances than a standard cast piston.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included in the box?\u003c\/strong\u003e\u003cbr\u003eThe kit is ready to install and includes the forged piston, high-quality ring set, wrist pin, and two retaining clips.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the skirt coating wear off immediately?\u003c\/strong\u003e\u003cbr\u003eThe coating is designed to assist during the critical break-in period to prevent scuffing, eventually wearing into a perfectly mated surface with your cylinder wall.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUpgrade Your Ride\u003c\/strong\u003e and get the reliability you need for the track or the trail. Buy the Wossner 8957DA Piston Kit today from Moto-House MX.\u003c\/p\u003e\n\u003cp\u003eMoto-House MX – \u003cstrong\u003eChoice of Champions\u003c\/strong\u003e – is located in Clermont\/Montverde, FL. The best motocross shop in Central Florida.\u003c\/p\u003e","brand":"WOSSNER","offers":[{"title":"Default Title","offer_id":44174189527123,"sku":"8957DA","price":184.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/1492057.png?v=1772930883","url":"https:\/\/motohousemx.com\/products\/wossner-8957da-14-0-1-piston-kit-76-96-mm-yamaha-yz250f-2019-2025","provider":"Moto-House MX","version":"1.0","type":"link"}