{"product_id":"2008-2009-polaris-sportsman-800-efi-ho-engine-rebuild-kit-new-prox-10-ek5805-a","title":"2008-2009 POLARIS SPORTSMAN 800 EFI HO ENGINE REBUILD KIT | NEW ProX 10.EK5805.A","description":"\u003ch2\u003e2008-2009 Polaris Sportsman 800 EFI H.O. Complete Engine Rebuild Kit | Standard Bore | NEW ProX | Part #10.EK5805.A\u003c\/h2\u003e\n\n\u003cp\u003eOffered here is a brand-new, genuine \u003cb\u003eProX Part #10.EK5805.A\u003c\/b\u003e complete engine rebuild kit, still in the original ProX package. ProX #10.EK5805.A is a full rotating and reciprocating assembly that brings your Sportsman 800 EFI H.O. engine back to like-new performance. Crankshaft, bearings, seals, pistons and gaskets come together in one kit, so a professional-grade rebuild is ready to go out of the box.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eConfirmed Fitment – Part #10.EK5805.A:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2008-2009 Polaris Sportsman 800 EFI H.O.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eProduct Highlights:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cb\u003e100% Genuine ProX – Part #10.EK5805.A\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003eBrand new in the original ProX package\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eStandard bore, A-grade kit\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFully assembled crankshaft\u003c\/b\u003e, pre-lubricated with Maxima assembly lube and factory-inspected for proper dimensions and trueness\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eProprietary forged connecting rods\u003c\/b\u003e, heat-treated and shot-peened for maximum tensile strength and reduced stress risers\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGraded big-end rod bearings\u003c\/b\u003e for precise clearance, plus bronze small-end bushings for longer life\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eHigh-performance cast pistons\u003c\/b\u003e made from factory-grade alloy, with MoS2 skirt coating for reduced friction\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eHard-anodized piston crowns and ring grooves\u003c\/b\u003e for better wear resistance and heat dissipation\u003c\/li\u003e\n\u003cli\u003ePremium Japanese-sourced \u003cb\u003eKoyo main bearings\u003c\/b\u003e with factory-quality seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eComplete gasket kit\u003c\/b\u003e for proper sealing throughout the engine\u003c\/li\u003e\n\u003cli\u003eCross-references to Drag Specialties \/ Parts Unlimited #0903-1693\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eWhat Is Included:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFully assembled crankshaft with connecting rods\u003c\/li\u003e\n\u003cli\u003eKoyo main bearings and seals\u003c\/li\u003e\n\u003cli\u003ePiston kits for both cylinders\u003c\/li\u003e\n\u003cli\u003eComplete engine gasket kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eSearch Keywords:\u003c\/b\u003e ProX 10.EK5805.A, Pro-X 10.EK5805.A, 0903-1693, Polaris Sportsman 800 rebuild kit, Sportsman 800 EFI HO engine kit, Polaris 800 crankshaft, Sportsman 800 crank, Polaris Sportsman 800 pistons, Polaris 800 bottom end kit, Sportsman 800 engine rebuild, ProX engine rebuild kit, Polaris ATV engine kit\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003ePlease confirm Part #10.EK5805.A fits your ATV prior to purchase.\u003c\/b\u003e We ship quickly from our own stock, packed securely and fully tracked to your door. Buy with confidence from a family-owned business with nearly 25 years of experience.\u003c\/p\u003e","brand":"PRO-X","offers":[{"title":"Default Title","offer_id":67618583085299,"sku":"24263","price":519.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1554\/9009\/files\/2026_09_30_aa_9999_25.jpg?v=1790879952","url":"https:\/\/www.nosoemparts.com\/products\/2008-2009-polaris-sportsman-800-efi-ho-engine-rebuild-kit-new-prox-10-ek5805-a","provider":"NOSOEMPARTS","version":"1.0","type":"link"}