{"product_id":"ref-56-w4961-a-wo","title":"WOSSNER 77mm PISTON KIT A, YAMAHA YZ250F 14-15, WR250F 15-17, YZ250FX 15-16","description":"\u003cbody\u003e\n\n\n\n\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003eThis Wossner forged piston kit, part number 8893DA, features a standard 77mm bore with an actual piston size of 76.96mm. It is engineered for TM MX-F450 (2009–2010), MX-Fi450 (2011), and EN-Fi450 (2011) models. Manufactured in Germany, the piston is designed for high-performance four-stroke applications, offering superior heat transfer, strength, and pressure distribution due to its elliptical profile.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003eForged construction for strength and long-lasting durability\u003c\/li\u003e \t\u003cli\u003eElliptical design for uniform expansion and thrust load balance\u003c\/li\u003e \t\u003cli\u003eOptimized for heat transfer in high-performance engines\u003c\/li\u003e \t\u003cli\u003eMade in Germany\u003c\/li\u003e \t\u003cli\u003eDirect OEM replacement\u003c\/li\u003e \t\u003cli\u003eEasy to install; professional installation recommended if unsure\u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003eBore Size: 77.00mm\u003c\/li\u003e \t\u003cli\u003eActual Piston Size: 76.96mm\u003c\/li\u003e \t\u003cli\u003eDisplacement: 249cm³\u003c\/li\u003e \t\u003cli\u003eStroke: 53.60mm\u003c\/li\u003e \t\u003cli\u003eClearance: 0.05mm\u003c\/li\u003e \t\u003cli\u003eDome Volume: -3.00cm³\u003c\/li\u003e \t\u003cli\u003eWossner Compression Ratio: 13.70:1\u003c\/li\u003e \t\u003cli\u003eOEM Compression Ratio: 13.50:1\u003c\/li\u003e \t\u003cli\u003eCompression Height: 20.20mm\u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eCross-Reference OEM Part Numbers\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003e40116M07700\u003c\/li\u003e \t\u003cli\u003e1SM-11631-01-00\u003c\/li\u003e \t\u003cli\u003eCW16 (Lock)\u003c\/li\u003e \t\u003cli\u003eWP087 (Pin)\u003c\/li\u003e \t\u003cli\u003e770XAS-2 (Ring Set)\u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eVehicle Fitments\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003eTM MX-F450 (2009–2010)\u003c\/li\u003e \t\u003cli\u003eTM MX-Fi450 (2011)\u003c\/li\u003e \t\u003cli\u003eTM EN-Fi450 (2011)\u003c\/li\u003e \u003c\/ul\u003e\n\u003cp\u003eMajority of our listings are for a direct replacement for your original part.\u003c\/p\u003e\n\u003cp\u003eOur parts are made of quality and are designed to meet or exceed the original OEM Standards.\u003c\/p\u003e\n\u003cp\u003eOur products are often a cost effective alternative to genuine OEM Parts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease note: \u003c\/strong\u003ethe models of bike we state in our listings are for general guidance only. Please make sure this item will fit your bike before purchasing. Also, we cannot guarantee fitment to any non-UK models. \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\n\u003c\/body\u003e","brand":"AW Motorcycle Parts","offers":[{"title":"Default Title","offer_id":55594840752502,"sku":"REF 56-W4961.A.WO","price":162.17,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/7032\/3318\/files\/stock55422_1.jpg?v=1746698831","url":"https:\/\/n0jgtc-nz.myshopify.com\/products\/ref-56-w4961-a-wo","provider":"AW Motorcycle Parts","version":"1.0","type":"link"}