{"product_id":"spi-020-over-bore-piston-kit-for-polaris-xc-500-xc-sp-500-rmk-classic-71mm","title":"SPI .020 Over Bore Piston Kit for Polaris XC 500, XC SP 500 RMK Classic 71mm","description":"\u003ch2\u003eSPI .020 Over Bore Piston Kit for Polaris\u003c\/h2\u003e\u003cp\u003eThis SPI .020 Over Bore Piston Kit is an aftermarket replacement for Polaris XC 500, XC SP 500, and RMK Classic snowmobiles, featuring a 71mm bore size to restore compression and performance.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis SPI .020 Over Bore Piston Kit provides a direct‑fit replacement piston for Polaris two‑stroke snowmobile engines. The 71mm bore and .020 over sizing compensate for cylinder wear, delivering fresh ring seal and restored power output for models like the XC 500 and RMK Classic.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eHigh‑strength cast piston with reinforced skirt for durability\u003c\/li\u003e\n\u003cli\u003eIncludes premium piston rings, wrist pin, and circlips\u003c\/li\u003e\n\u003cli\u003ePrecision‑machined to exact OEM dimensions for easy installation\u003c\/li\u003e\n\u003cli\u003eLightweight design reduces reciprocating mass for snappier throttle response\u003c\/li\u003e\n\u003cli\u003eCompatible with standard fuel and oil mixtures\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Polaris XC 500\u003c\/li\u003e\n\u003cli\u003efor Polaris XC SP 500\u003c\/li\u003e\n\u003cli\u003efor Polaris RMK Classic\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSnowmobile trail riding and cross‑country touring\u003c\/li\u003e\n\u003cli\u003eMountain and deep‑snow riding\u003c\/li\u003e\n\u003cli\u003ePerformance recreation and ice racing\u003c\/li\u003e\n\u003cli\u003eEngine rebuilds and top‑end overhauls\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\u003e71mm\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 Over\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePiston Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolaris XC 500, XC SP 500, RMK Classic\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? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, a fresh cylinder hone is essential to ensure proper ring seating and crosshatch for oil retention.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can this kit be used with aftermarket cylinder porting? \u003cstrong\u003eA:\u003c\/strong\u003e It may be used with mild porting, but always verify piston‑to‑wall clearance and ring end gap before final assembly.\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":44890935918678,"sku":"SZ1F13629","price":175.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_cb31079d-f456-4a59-bb6a-5793f202adcb.jpg?v=1781144375","url":"https:\/\/www.solidspare.com\/products\/spi-020-over-bore-piston-kit-for-polaris-xc-500-xc-sp-500-rmk-classic-71mm","provider":"Solid Spare","version":"1.0","type":"link"}