{"product_id":"598m04400-wiseco-big-bore-piston-kit-for-yamaha-ysr50-1987-1992-44-00-mm","title":"598M04400 Wiseco Big Bore Piston Kit for Yamaha YSR50 1987-1992 44.00 mm","description":"\u003ch2\u003eWiseco Big Bore Piston Kit for Yamaha YSR50\u003c\/h2\u003e\u003cp\u003eThis Wiseco big bore piston kit for Yamaha YSR50 machines lifts displacement on 1987 through 1992 models, cross-referencing 598M04400 at a 44.00 mm bore size.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis Wiseco big bore piston kit for Yamaha YSR50 mini sport bikes adds displacement to the small two-stroke motor used from 1987 through 1992. The kit runs a 44.00 mm bore and cross-references 598M04400, making it a straightforward way to rebuild or wake up a tired top end. It suits YSR50 owners, pocket bike builders, and hobby racers chasing more punch from the little single.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eWiseco forged piston construction for reliable service in a high-revving two-stroke\u003c\/li\u003e\n\u003cli\u003eBig bore 44.00 mm sizing increases displacement over the stock cylinder\u003c\/li\u003e\n\u003cli\u003eCross-references part number 598M04400 for easy verification\u003c\/li\u003e\n\u003cli\u003eKit format supplies the piston and matching components for the rebuild\u003c\/li\u003e\n\u003cli\u003eSuits fresh top end builds and performance refreshes on the YSR50\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha YSR50 1987\u003c\/li\u003e\n\u003cli\u003efor Yamaha YSR50 1988\u003c\/li\u003e\n\u003cli\u003efor Yamaha YSR50 1989\u003c\/li\u003e\n\u003cli\u003efor Yamaha YSR50 1990\u003c\/li\u003e\n\u003cli\u003efor Yamaha YSR50 1991\u003c\/li\u003e\n\u003cli\u003efor Yamaha YSR50 1992\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop end rebuilds on YSR50 mini sport bikes\u003c\/li\u003e\n\u003cli\u003eBig bore builds that need a matching oversize piston\u003c\/li\u003e\n\u003cli\u003ePocket bike and mini moto performance projects\u003c\/li\u003e\n\u003cli\u003eRefreshing a high-hour 50cc two-stroke engine\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\u003e598M04400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e44.00 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBig Bore Piston Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMachine Fitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003efor Yamaha YSR50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYear Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1987-1992\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 a big bore kit need cylinder work? \u003cstrong\u003eA:\u003c\/strong\u003e A 44.00 mm big bore piston typically requires the cylinder to be bored, plated, or replaced to match the new size. Confirm your cylinder setup before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Will this fit other Yamaha 50cc models? \u003cstrong\u003eA:\u003c\/strong\u003e This kit is listed for the YSR50 from 1987 through 1992. Compare your bore and piston dimensions against the part number before purchase.\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":51140091904086,"sku":"OO1C22541","price":257.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_e59556a7-08f8-4700-8d9c-41fc12a93a5f.jpg?v=1794565905","url":"https:\/\/www.solidspare.com\/products\/598m04400-wiseco-big-bore-piston-kit-for-yamaha-ysr50-1987-1992-44-00-mm","provider":"Solid Spare","version":"1.0","type":"link"}