{"product_id":"namura-040-over-bore-top-end-kit-for-polaris-570-sportsman-rzr-ranger-100mm","title":"Namura .040 Over Bore Top End Kit for Polaris 570 Sportsman RZR Ranger 100mm","description":"\u003ch2\u003eNamura .040 Over Bore Top End Kit for Polaris 570\u003c\/h2\u003e\u003cp\u003eThis top end repair kit overbores the Polaris 570 engine to 100mm, providing a complete cylinder and piston assembly for Sportsman, RZR, and Ranger models.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe Namura .040 Over Bore Top End Kit is a direct-fit cylinder and piston assembly designed for Polaris 570 engines found in Sportsman, RZR, and Ranger vehicles. It overbores the original 95mm cylinder to 100mm, restoring lost compression and power while eliminating cylinder scoring. This kit is ideal for high-mileage or damaged engines requiring a complete top-end rebuild.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePrecision-cast cylinder with 100mm bore for increased displacement\u003c\/li\u003e\n\u003cli\u003eIncludes forged piston, rings, wrist pin, and circlips\u003c\/li\u003e\n\u003cli\u003eCompatible with stock Polaris 570 crankshaft and connecting rod\u003c\/li\u003e\n\u003cli\u003eOversized .040 over bore removes cylinder damage and restores compression\u003c\/li\u003e\n\u003cli\u003eAll necessary gaskets included for a complete installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Polaris Sportsman 570\u003c\/li\u003e\n\u003cli\u003efor Polaris RZR 570\u003c\/li\u003e\n\u003cli\u003efor Polaris Ranger 570\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRestoring power in high-mileage utility and trail vehicles\u003c\/li\u003e\n\u003cli\u003eRebuilding engines after top-end failure or overheating\u003c\/li\u003e\n\u003cli\u003eUpgrading displacement for improved torque in work applications\u003c\/li\u003e\n\u003cli\u003eReplacing worn cylinders that show scoring or excessive wear\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\u003e100mm (.040 over)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStroke\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStock Polaris 570\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCast iron cylinder with chrome-plated bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNamura top end kit\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 kit require any special tools to install? \u003cstrong\u003eA:\u003c\/strong\u003e Standard engine rebuild tools are needed, including a torque wrench and piston ring compressor. Always follow the factory service manual for proper assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can I reuse my old cylinder head with this kit? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, the existing cylinder head can be reused provided it is in good condition and the gasket surface is clean.\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":44949840461910,"sku":"SZ1F15693","price":329.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_5e911787-8937-4892-b1ba-1b4449a418bb.jpg?v=1781400094","url":"https:\/\/www.solidspare.com\/products\/namura-040-over-bore-top-end-kit-for-polaris-570-sportsman-rzr-ranger-100mm","provider":"Solid Spare","version":"1.0","type":"link"}