{"product_id":"standard-bore-piston-kit-for-polaris-big-boss-250-1989-1993","title":"Standard Bore Piston Kit for Polaris Big Boss 250 1989-1993","description":"\u003ch2\u003eStandard Bore Piston Kit for Polaris Big Boss 250\u003c\/h2\u003e\u003cp\u003eThis standard bore piston kit is built for the Polaris Big Boss 250 and supplies the piston, rings, wrist pin, and circlips needed to refresh a worn top end so the engine can regain reliable compression.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis standard bore piston kit for the Polaris Big Boss 250 is a direct-fit top end replacement intended for riders who need to rebuild a tired engine. The kit restores the piston-to-cylinder seal so the Polaris Big Boss 250 can once again deliver steady power and dependable starting. It is aimed at DIY mechanics and shops performing routine top end service on these older machines.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eStandard bore sizing for stock cylinders that have not been overbored\u003c\/li\u003e\n\u003cli\u003eIncludes piston, rings, wrist pin, and circlips for a complete top end install\u003c\/li\u003e\n\u003cli\u003eMachined piston body for consistent fit inside the cylinder\u003c\/li\u003e\n\u003cli\u003eRings designed to seat and seal against the cylinder wall for proper compression\u003c\/li\u003e\n\u003cli\u003eWrist pin and circlips included to secure the piston to the connecting rod\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\u003cli\u003efor Polaris Big Boss 250 (1989-1993)\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop end rebuild after loss of compression\u003c\/li\u003e\n\u003cli\u003eRoutine engine refresh on a high-hour machine\u003c\/li\u003e\n\u003cli\u003eRestoring a project or vintage utility ATV\u003c\/li\u003e\n\u003cli\u003eReplacing a scored or worn piston\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 Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard bore piston kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003efor Polaris Big Boss 250 1989-1993\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIncluded Components\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePiston, rings, wrist pin, circlips\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 measure my cylinder before ordering? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, confirm the cylinder is still at standard bore, since a worn or previously overbored cylinder may require a different piston size.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Is this kit enough to complete a top end rebuild? \u003cstrong\u003eA:\u003c\/strong\u003e It covers the piston and related hardware, but you should also inspect the cylinder, gaskets, and bearings while the top end is apart.\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":51144967422038,"sku":"OO1C25874","price":120.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_7e9a5af9-0b09-4fd4-8e43-b856cdcf8009.jpg?v=1794497169","url":"https:\/\/www.solidspare.com\/products\/standard-bore-piston-kit-for-polaris-big-boss-250-1989-1993","provider":"Solid Spare","version":"1.0","type":"link"}