{"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\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\n\u003c\/body\u003e","brand":"Wossner","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=1783536224","url":"https:\/\/www.awmotorcycleparts.co.uk\/products\/ref-56-w4961-a-wo","provider":"AW Motorcycle Parts","version":"1.0","type":"link"}