{"product_id":"4854m06650-wiseco-040-piston-66-50mm-13-5-1-for-yamaha-yzf-r6-yzf-r6s-2001-2005","title":"4854M06650 Wiseco .040 Piston 66.50mm 13.5:1 for Yamaha YZF-R6 YZF-R6S 2001-2005","description":"\u003ch2\u003eWiseco .040 Piston for Yamaha\u003c\/h2\u003e\u003cp\u003eThis .040 overbore piston for Yamaha YZF-R6 and YZF-R6S engines replaces OEM part 4854M06650, measuring 66.50mm with a 13.5:1 compression ratio.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis Wiseco .040 piston for Yamaha YZF-R6 and YZF-R6S machines is a forged replacement piston for engine rebuilds and top-end work on 2001-2005 models. The .040 piston for Yamaha restores compression and bore geometry after cylinder work, making it a fit for riders and mechanics rebuilding worn top ends. Each .040 piston for Yamaha is sized to 66.50mm with a 13.5:1 compression ratio for the specified engine family.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e66.50mm bore size for .040 overbore applications\u003c\/li\u003e\n\u003cli\u003e13.5:1 compression ratio for strong cylinder pressure\u003c\/li\u003e\n\u003cli\u003eForged construction for strength under heat and load\u003c\/li\u003e\n\u003cli\u003eOEM cross-reference 4854M06650 for easy lookup\u003c\/li\u003e\n\u003cli\u003eDirect fitment for Yamaha YZF-R6 and YZF-R6S 2001-2005 engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha YZF-R6 2001-2005\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZF-R6S 2001-2005\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end rebuilds after cylinder boring or honing\u003c\/li\u003e\n\u003cli\u003eRestoring compression on high-mileage engines\u003c\/li\u003e\n\u003cli\u003eRace and track engine refreshes requiring overbore sizing\u003c\/li\u003e\n\u003cli\u003eShop builds where OEM bore replacement is needed\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4854M06650\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e66.50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverbore\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e.040\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompression Ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13.5:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eForged aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does this piston require cylinder boring? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, a .040 overbore piston needs the cylinder bored and honed to match 66.50mm before installation. Confirm your machine shop's final bore measurement against the piston spec.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Is this an OEM Yamaha piston? \u003cstrong\u003eA:\u003c\/strong\u003e No, this is an aftermarket piston cross-referenced to OEM number 4854M06650. Verify fitment against your engine before ordering.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":51139961389142,"sku":"OO1C22359","price":435.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_0aac16f9-224e-4a83-a52d-574d78ab7f14.jpg?v=1794565772","url":"https:\/\/www.solidspare.com\/products\/4854m06650-wiseco-040-piston-66-50mm-13-5-1-for-yamaha-yzf-r6-yzf-r6s-2001-2005","provider":"Solid Spare","version":"1.0","type":"link"}