{"product_id":"piston-kit-1983-85-yz125-56-5-wossner-8119d050-yamaha-39w-11-630-00-00","title":"PISTON KIT 1983 \u002685 YZ125 56.5, WOSSNER 8119D050 YAMAHA 39W-11-630-00-00","description":"\u003cp\u003eThis Wossner piston kit features a 56.50mm bore (+0.01 oversize) and is designed for Yamaha YZ125 models from 1983 and 1985. Wossner forged pistons are engineered to offer superior strength and efficient heat transfer from the combustion chamber to the cylinder walls. The elliptical design ensures a uniform bearing surface under heat expansion, distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eForged construction for increased strength\u003c\/li\u003e\n\t\u003cli\u003eOptimized heat transfer to cylinder walls\u003c\/li\u003e\n\t\u003cli\u003eElliptical design for uniform bearing surface and thrust load distribution\u003c\/li\u003e\n\t\u003cli\u003eMade in Germany\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eBore Size: 56.50mm\u003c\/li\u003e\n\t\u003cli\u003eBore (Actual Measured): 56.44mm\u003c\/li\u003e\n\t\u003cli\u003eDisplay Volume: 83 cm³\u003c\/li\u003e\n\t\u003cli\u003eStroke: 84.00mm\u003c\/li\u003e\n\t\u003cli\u003eClearance: 0.06mm\u003c\/li\u003e\n\t\u003cli\u003eCompression Ratio (Wossner): 2-stroke\u003c\/li\u003e\n\t\u003cli\u003eCompression Ratio (OEM): 2-stroke\u003c\/li\u003e\n\t\u003cli\u003eCompression Height: 30.80mm\u003c\/li\u003e\n\t\u003cli\u003eLock Part Number: CW16\u003c\/li\u003e\n\t\u003cli\u003ePin Part Number: WP036\u003c\/li\u003e\n\t\u003cli\u003eRing Set Part Number: RSB5600\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCross-Reference OEM Part Numbers\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e39W-11-630-00-00\u003c\/li\u003e\n\t\u003cli\u003e55Y-11631-00-94\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eVehicle Fitments\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eYamaha YZ125 1983\u003c\/li\u003e\n\t\u003cli\u003eYamaha YZ125 1985\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Wossner","offers":[{"title":"Default Title","offer_id":51391879708938,"sku":"56-w503+050.wo","price":121.22,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0898\/2757\/4026\/files\/image-1-6E27DA70-C5C9-4273-AB79-27F2CA90CB7C_56-W503_050.WO.jpg?v=1750687715","url":"https:\/\/2bros-mx.com\/products\/piston-kit-1983-85-yz125-56-5-wossner-8119d050-yamaha-39w-11-630-00-00","provider":"2bros-mx.com","version":"1.0","type":"link"}