{"product_id":"namura-040-over-bore-piston-kit-for-polaris-big-boss-250-4x6-6x6-1989-1993-73mm","title":"Namura .040 Over Bore Piston Kit for Polaris Big Boss 250 4x6 6x6 1989-1993 73mm","description":"\u003ch2\u003eNamura .040 Over Bore Piston Kit for Polaris\u003c\/h2\u003e\u003cp\u003eThis aftermarket .040 over bore piston kit replaces the original piston in Polaris Big Boss 250 4x6 and 6x6 ATVs from 1989 to 1993, featuring a 73mm bore diameter for reliable performance.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis Namura .040 over bore piston kit is designed for Polaris Big Boss 250 models built between 1989 and 1993. It provides a direct replacement for the factory piston, restoring compression and power. The piston kit includes a 73mm piston, rings, and wrist pin for a complete rebuild.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePrecision-machined from high-strength aluminum alloy\u003c\/li\u003e\n\u003cli\u003eIncludes premium steel rings for improved sealing\u003c\/li\u003e\n\u003cli\u003eDesigned for .040 over bore to restore cylinder clearance\u003c\/li\u003e\n\u003cli\u003eKit contains piston, rings, wrist pin, and circlips\u003c\/li\u003e\n\u003cli\u003eDirect fit for 73mm bore applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Polaris Big Boss 250 4x6 (1989-1993)\u003c\/li\u003e\n\u003cli\u003efor Polaris Big Boss 250 6x6 (1989-1993)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRecreational riding on trails\u003c\/li\u003e\n\u003cli\u003eUtility work and hauling\u003c\/li\u003e\n\u003cli\u003eEngine rebuild and restoration projects\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\u003e73mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOver Bore\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e.040\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolaris Big Boss 250 4x6\/6x6 (1989-1993)\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 piston kit come with rings? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, the kit includes piston rings, wrist pin, and circlips for a complete installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Is this a direct fit for my 1991 Polaris Big Boss 250 6x6? \u003cstrong\u003eA:\u003c\/strong\u003e This piston kit is designed for 1989-1993 Polaris Big Boss 250 models with a 73mm bore; verify your cylinder bore 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":44890489421910,"sku":"SZ1F11829","price":136.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_c2c7372d-9945-4aac-a084-d3b7a40fd81d.jpg?v=1781140571","url":"https:\/\/www.solidspare.com\/products\/namura-040-over-bore-piston-kit-for-polaris-big-boss-250-4x6-6x6-1989-1993-73mm","provider":"Solid Spare","version":"1.0","type":"link"}