{"product_id":"spi-020-over-bore-piston-kit-for-yamaha-ex440-exciter-gp433-gp440-pr440-68-5mm","title":"SPI .020 Over Bore Piston Kit for Yamaha EX440 Exciter GP433 GP440 PR440 68.5mm","description":"\u003ch2\u003eSPI .020 Over Bore Piston Kit for Yamaha\u003c\/h2\u003e\u003cp\u003eThis SPI .020 over bore piston kit is designed for Yamaha EX440 Exciter GP433 GP440 and PR440 engines featuring a 68.5mm bore size to deliver smooth operation and long service life.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe SPI .020 over bore piston kit is an ideal solution for restoring your Yamaha snowmobile engine. This over bore piston kit increases the cylinder bore by .020 inches to compensate for wear using a 68.5mm piston. It is specifically engineered for the EX440 Exciter GP433 GP440 and PR440 models ensuring a precise fit and reliable performance.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eIncludes piston rings wrist pin and circlips for a complete rebuild\u003c\/li\u003e\n\u003cli\u003eConstructed from durable aluminum alloy for high strength and heat resistance\u003c\/li\u003e\n\u003cli\u003eOversized .020 over bore allows cylinder repair without replacement\u003c\/li\u003e\n\u003cli\u003ePrecision machined to exacting tolerances for consistent compression\u003c\/li\u003e\n\u003cli\u003eDesigned for high-revving snowmobile engines to withstand demanding conditions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha EX440\u003c\/li\u003e\n\u003cli\u003efor Yamaha Exciter\u003c\/li\u003e\n\u003cli\u003efor Yamaha GP433\u003c\/li\u003e\n\u003cli\u003efor Yamaha GP440\u003c\/li\u003e\n\u003cli\u003efor Yamaha PR440\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eUsed for rebuilding snowmobile engines after cylinder wear\u003c\/li\u003e\n\u003cli\u003eIdeal for restoring lost compression and power output\u003c\/li\u003e\n\u003cli\u003eCommonly used in recreational trail riding and racing applications\u003c\/li\u003e\n\u003cli\u003eSuitable for engine overhauls and top-end rebuilds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e68.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOversize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e.020 in (0.5mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAluminum Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYamaha EX440\/Exciter\/GP433\/GP440\/PR440\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 What is the benefit of using an over bore piston kit? \u003cstrong\u003eA:\u003c\/strong\u003e An over bore piston kit allows you to restore engine compression by enlarging the cylinder bore accommodating a larger piston to compensate for wear.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can this kit be used on other Yamaha models? \u003cstrong\u003eA:\u003c\/strong\u003e This kit is specifically designed for the EX440 Exciter GP433 GP440 and PR440; always verify your cylinder bore size and serial number 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":44890477264982,"sku":"SZ1F11503","price":131.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_de88c918-0ff9-4675-8ad6-6894807dea42.jpg?v=1781140149","url":"https:\/\/www.solidspare.com\/products\/spi-020-over-bore-piston-kit-for-yamaha-ex440-exciter-gp433-gp440-pr440-68-5mm","provider":"Solid Spare","version":"1.0","type":"link"}