PROX Engine Rebuild Kit - Standard Bore - Polaris

Complete rotating and reciprocating rebuild kit including crankshaft assembly, main bearings and seals, pistons and components, and a complete engine gasket kitAll components were developed through extensive research and development on ProX's in-house engine dynoCrankshafts come completely assembled using Maxima assembly lube and are inspected in-house for proper dimensions and truenessConnecting rods feature proprietary design done in-house, and are forged, heat-treated, and shot-peened for ultimate tensile strength and reduced stress risersConnecting rods include graded bearings in the big end to ensure proper clearance, as well as a bronze bushing in the small end, both improving longevity and performancePistons are cast from OEM-grade alloy and feature MOS2 skirt coating and hard-anodized crown and ring grooves for improved performance and wear resistance through reduced friction and improved heat resistanceIncludes Japanese-sourced, Koyo main bearings along with OEM quality seals and complete gasket kit to ensure a reliable engine rebuildMore applications covered in fewer part numbers with versatile gasket kits and compression ratiosAvailable in A/B/C graded bore sizes.