{"product_id":"ref-56-w4961-c-wo","title":"WOSSNER 77mm PISTON KIT C, 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 8893DC, features a 77.02mm bore with an actual piston size of 76.98mm (+0.02mm oversize). Designed for TM MX-F450 (2009–2010), MX-Fi450 (2011), and EN-Fi450 (2011), this German-made piston is engineered for performance with high strength, efficient heat transfer, and balanced load distribution through its elliptical profile, offering a compression increase over OEM specifications.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003eForged construction for strength and durability in performance applications\u003c\/li\u003e \t\u003cli\u003eElliptical design supports even thermal expansion and thrust load distribution\u003c\/li\u003e \t\u003cli\u003eOptimized for efficient combustion heat transfer\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: 77.02mm\u003c\/li\u003e \t\u003cli\u003eActual Piston Size: 76.98mm\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\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":55594841178486,"sku":"REF 56-W4961.C.WO","price":162.17,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/7032\/3318\/files\/stock55426_1.jpg?v=1783536319","url":"https:\/\/www.awmotorcycleparts.co.uk\/products\/ref-56-w4961-c-wo","provider":"AW Motorcycle Parts","version":"1.0","type":"link"}