{"product_id":"ref-56-w239-a-wo","title":"WOSSNER 77mm FORGED HC PISTON KIT A, YAMAHA WR250X 08-12, WR250R 08-20,","description":"\u003cbody\u003e\n\n\n\n\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003eWossner forged piston kit with a 77.00mm bore and 76.96mm diameter, designed for Yamaha WR250X models. This Pro Series piston is engineered for high performance, featuring superior strength and design. Manufactured in Germany, it ensures optimal heat transfer to cylinder walls. Its elliptical design provides a uniform bearing surface under heat expansion, reducing localized pressure and evenly distributing thrust loads to prevent piston collapse.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003eForged construction for superior strength\u003c\/li\u003e \t\u003cli\u003eOptimized heat transfer for efficient combustion\u003c\/li\u003e \t\u003cli\u003eElliptical design for uniform load distribution\u003c\/li\u003e \t\u003cli\u003eHigh compression ratio for increased performance\u003c\/li\u003e \t\u003cli\u003eManufactured in Germany\u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003eBore: 77.00mm\u003c\/li\u003e \t\u003cli\u003eDiameter: 76.96mm\u003c\/li\u003e \t\u003cli\u003eDisplay (cm³): 249\u003c\/li\u003e \t\u003cli\u003eStroke (mm): 53.60\u003c\/li\u003e \t\u003cli\u003eClearance (mm): 0.04\u003c\/li\u003e \t\u003cli\u003eWossner Compression Ratio: 13.50:1\u003c\/li\u003e \t\u003cli\u003eOEM Compression Ratio: 11.80:1\u003c\/li\u003e \t\u003cli\u003eDome Volume (cm³): -4.50\u003c\/li\u003e \t\u003cli\u003eCompression Height (mm): 22.20\u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eCross-Reference OEM Part Numbers\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003eWossner Piston Yamaha WR250X (PN# 8772DA)\u003c\/li\u003e \t\u003cli\u003eLock P\/N: CW17\u003c\/li\u003e \t\u003cli\u003ePin P\/N: WP083\u003c\/li\u003e \t\u003cli\u003eRing Set P\/N: 770XAS-2\u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eVehicle Fitments\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003eYamaha WR250X (2008-2009)\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":55594740646262,"sku":"REF 56-W239.A.WO","price":162.17,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/7032\/3318\/files\/stock54097_1.jpg?v=1746698969","url":"https:\/\/n0jgtc-nz.myshopify.com\/products\/ref-56-w239-a-wo","provider":"AW Motorcycle Parts","version":"1.0","type":"link"}