{"product_id":"piston-kit-02-07-ktm-exc450-89-wossner-wossner-8581dc","title":"Piston Kit 02-07 KTM EXC450 89, Wossner Wossner 8581DC","description":"\u003cp\u003eWossner forged piston kit with an 89.02mm bore, designed for KTM EXC 450 Racing, Beta RR450, and Polaris Outlaw 450 MXR models. Engineered for optimal combustion chamber heat transfer and uniform bearing surface under heat expansion, reducing localized pressure and piston collapse. Manufactured in Germany for durability and precision.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eForged piston for superior strength and design\u003c\/li\u003e \u003cli\u003eOptimized heat transfer to cylinder walls\u003c\/li\u003e \u003cli\u003eElliptical design for uniform bearing surface and even thrust load distribution\u003c\/li\u003e \u003cli\u003eManufactured in Germany\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eBore: 89.02mm (+0.02mm oversize)\u003c\/li\u003e \u003cli\u003eStandard size piston (PN# 8581DC)\u003c\/li\u003e \u003cli\u003eLock Part Number: CW20\u003c\/li\u003e \u003cli\u003ePin Part Number: WP038\u003c\/li\u003e \u003cli\u003eRing Set Part Number: 890XSY\u003c\/li\u003e \u003cli\u003eDisplacement: 449 cm³\u003c\/li\u003e \u003cli\u003eStroke: 72.00mm\u003c\/li\u003e \u003cli\u003eClearance: 0.04mm\u003c\/li\u003e \u003cli\u003eWossner Compression Ratio: OEM\u003c\/li\u003e \u003cli\u003eOEM Compression Ratio: 11.10:1\u003c\/li\u003e \u003cli\u003eDome Volume: +7.10 cm³\u003c\/li\u003e \u003cli\u003eCompression Height: 23.50mm\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eCross-Reference OEM Part Numbers\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eNot provided\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eVehicle Fitments\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eKTM EXC 450 Racing (2003-2007)\u003c\/li\u003e \u003cli\u003eBeta RR450 (2005-2009)\u003c\/li\u003e \u003cli\u003ePolaris Outlaw 450 MXR (2008-2011)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- venture-connect-compatibility:start --\u003e\n\u003csection class=\"venture-connect-compatibility\"\u003e\u003ch3\u003eVehicle Compatibility\u003c\/h3\u003e\n\u003cp\u003ePlease check the exact model and year before ordering.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eManufacturer\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eKTM\u003c\/td\u003e\n\u003ctd\u003eEXC 450\u003c\/td\u003e\n\u003ctd\u003e2003-2007\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePOLARIS\u003c\/td\u003e\n\u003ctd\u003eOUTLAW MXR 450\u003c\/td\u003e\n\u003ctd\u003e2008-2010\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKTM\u003c\/td\u003e\n\u003ctd\u003eXC ATV 450\u003c\/td\u003e\n\u003ctd\u003e2008-2009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKTM\u003c\/td\u003e\n\u003ctd\u003eXC 450\u003c\/td\u003e\n\u003ctd\u003e2008-2009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKTM\u003c\/td\u003e\n\u003ctd\u003eEXC R 450\u003c\/td\u003e\n\u003ctd\u003e2003-2007\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBETA\u003c\/td\u003e\n\u003ctd\u003eRR 450\u003c\/td\u003e\n\u003ctd\u003e2005-2009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePOLARIS\u003c\/td\u003e\n\u003ctd\u003eOUTLAW MXR 450\u003c\/td\u003e\n\u003ctd\u003e2008-2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003c\/section\u003e\n\u003c!-- venture-connect-compatibility:end --\u003e","brand":"Wossner","offers":[{"title":"Default Title","offer_id":57506529673596,"sku":"56-W178.C","price":0.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/3952\/8167\/files\/stock53815_1.jpg?v=1790477188","url":"https:\/\/radhouse.co.uk\/products\/piston-kit-02-07-ktm-exc450-89-wossner-wossner-8581dc","provider":"Radhouse","version":"1.0","type":"link"}