{"product_id":"spi-020-over-bore-piston-kit-for-polaris-550-fan-cooled-1999-2021-73-5mm","title":"SPI .020 Over Bore Piston Kit for Polaris 550 Fan Cooled 1999-2021 - 73.5mm","description":"\u003ch2\u003eSPI .020 Over Bore Piston Kit for Polaris 550 Fan Cooled\u003c\/h2\u003e\u003cp\u003eThis SPI .020 over bore piston kit is a direct replacement for Polaris 550 fan cooled engines from 1999-2021. The 73.5mm piston kit includes rings and wrist pin for a complete top-end rebuild.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eDesigned for Polaris 550 fan cooled snowmobile and ATV engines, this SPI .020 over bore piston kit brings the bore to 73.5mm to restore compression and power. The kit contains a cast piston, piston rings, and wrist pin, making it a convenient solution for engine rebuilds.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCast aluminum piston with precision-machined ring grooves\u003c\/li\u003e\n\u003cli\u003eIncludes high-quality piston rings for proper sealing\u003c\/li\u003e\n\u003cli\u003eWrist pin and circlips included for complete installation\u003c\/li\u003e\n\u003cli\u003e0.020 inch overbore provides a clean cylinder surface\u003c\/li\u003e\n\u003cli\u003eMatch-ported to factory specifications for reliable operation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Polaris 550 fan cooled engines (1999-2021)\u003c\/li\u003e\n\u003cli\u003efor Polaris snowmobiles with 550 fan cooled engine\u003c\/li\u003e\n\u003cli\u003efor Polaris ATVs with 550 fan cooled engine\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eEngine rebuilds after cylinder wear or piston damage\u003c\/li\u003e\n\u003cli\u003ePerformance restoration for older Polaris 550 fan cooled engines\u003c\/li\u003e\n\u003cli\u003eTop-end overhaul during seasonal maintenance\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\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e73.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverbore\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.020 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolaris 550 Fan Cooled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYear Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1999-2021\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 Do I need to hone the cylinder before installing this piston kit? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, the cylinder should be professionally honed to the correct 73.5mm bore size to ensure proper ring seating and compression.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can I use this piston kit in a Polaris 550 liquid cooled engine? \u003cstrong\u003eA:\u003c\/strong\u003e No, this kit is specifically designed for the fan cooled version only, so confirm your engine type before purchasing.\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":44890480377942,"sku":"SZ1F11590","price":131.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_018abc85-d960-4260-81a6-5afd3341c4a5.jpg?v=1781140263","url":"https:\/\/www.solidspare.com\/products\/spi-020-over-bore-piston-kit-for-polaris-550-fan-cooled-1999-2021-73-5mm","provider":"Solid Spare","version":"1.0","type":"link"}