ProX 10.EK5806.A1 Complete Engine Rebuild Kit for Polaris 800

The ProX 10.EK5806.A1 Engine Rebuild Kit is a complete rotating and reciprocating rebuild solution for Polaris 800 engines. This all-inclusive kit bundles a fully assembled crankshaft, main bearings and seals, pistons with components, and a full engine gasket set — everything needed to restore your engine to like-new performance in a single part number.

Every component in this kit was engineered and validated on ProX's in-house engine dynamometer, ensuring real-world performance and reliability before it ever reaches your machine.

Crankshaft Assembly

• Arrives fully pre-assembled and lubricated with Maxima® assembly lube
• Each unit is individually inspected in-house for correct dimensions and trueness

Connecting Rods

• Proprietary in-house design, forged, heat-treated, and shot-peened for maximum tensile strength and reduced stress risers
• Graded bearings at the big end ensure precise oil clearance
• Bronze bushing in the small end promotes long service life and consistent performance

Pistons

• Cast from OEM-grade aluminum alloy
• MOS2 (molybdenum disulfide) skirt coating reduces friction for improved break-in and longevity
• Hard-anodized crown and ring grooves resist heat and wear
• Available in A, B, and C graded bore sizes to restore cylinders to factory specs without boring
• Each piston kit includes piston, rings, pin, and circlips

Bearings, Seals & Gaskets

• Japanese-sourced Koyo main bearings for proven durability
• OEM-quality seals throughout
• Complete engine gasket kit included — no additional gasket set required

The ProX 10.EK5806.A1 kit is designed to interchange directly with OEM components, making installation straightforward and keeping downtime to a minimum. Cross-reference: W19-EK5806A1.