{"product_id":"2008-2009-polaris-sportsman-800-efi-ho-engine-rebuild-kit-new-prox-10-ek5805-c","title":"2008-2009 POLARIS SPORTSMAN 800 EFI HO ENGINE REBUILD KIT | NEW ProX 10.EK5805.C","description":"\u003ch2\u003e2008-2009 Polaris Sportsman 800 EFI H.O. Complete Engine Rebuild Kit | +0.02 mm Oversize | NEW ProX | Part #10.EK5805.C\u003c\/h2\u003e\n\n\u003cp\u003eOffered here is a brand-new, genuine \u003cb\u003eProX Part #10.EK5805.C\u003c\/b\u003e complete engine rebuild kit, still in the original ProX package. ProX #10.EK5805.C is a full \u003cb\u003e+0.02 mm oversize\u003c\/b\u003e rotating and reciprocating rebuild kit for the Sportsman 800 EFI H.O. The kit includes the crankshaft assembly, main bearings and seals, pistons and a complete engine gasket kit. Every component was developed and validated on ProX's in-house engine dyno.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eConfirmed Fitment – Part #10.EK5805.C:\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.C\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003eBrand new in the original ProX package\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003e+0.02 mm oversize\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCrankshaft comes fully assembled\u003c\/b\u003e with Maxima assembly lube and is inspected in-house for proper dimensions and trueness\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eProprietary in-house connecting rod design\u003c\/b\u003e, forged, heat-treated and shot-peened for ultimate tensile strength and reduced stress risers\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGraded big-end rod bearings\u003c\/b\u003e for proper clearance, plus a bronze small-end bushing for longer life and better performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePistons cast from factory-grade alloy\u003c\/b\u003e with MoS2 skirt coating for reduced friction\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eHard-anodized crowns and ring grooves\u003c\/b\u003e for improved wear resistance and heat resistance\u003c\/li\u003e\n\u003cli\u003eAll components developed through extensive testing on \u003cb\u003eProX's in-house engine dyno\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003eCross-references to Drag Specialties \/ Parts Unlimited #0903-1695\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\u003eMain 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.C, Pro-X 10.EK5805.C, 0903-1695, Polaris Sportsman 800 rebuild kit, Sportsman 800 EFI HO engine kit, Sportsman 800 oversize pistons, 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.C fits your ATV prior to purchase.\u003c\/b\u003e Orders go out fast from our own shelves, securely packed and fully tracked. 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":67618583183603,"sku":"24264","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_134.jpg?v=1790879953","url":"https:\/\/www.nosoemparts.com\/products\/2008-2009-polaris-sportsman-800-efi-ho-engine-rebuild-kit-new-prox-10-ek5805-c","provider":"NOSOEMPARTS","version":"1.0","type":"link"}