Product Description

Engine Rebuild Kit is available now from Knobtown Cycle, your Kansas City motorcycle parts specialists.

Key Features

• Complete rotating and reciprocating rebuild kit including crankshaft assembly, main bearings and seals, pistons and components, and a complete engine gasket kit
• All components were developed through extensive research and development on ProX’s in-house engine dyno
• Crankshafts come completely assembled using Maxima® assembly lube and are inspected in-house for proper dimensions and trueness
• Connecting rods feature proprietary design done in-house, and are forged, heat-treated, and shot-peened for ultimate tensile strength and reduced stress risers
• Connecting 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 performance
• Pistons 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 resistance
• Includes Japanese-sourced, Koyo main bearings along with OEM quality seals and complete gasket kit to ensure a reliable engine rebuild
• More applications covered in fewer part numbers with versatile gasket kits and compression ratios
• Available in A/B/C graded bore sizes

Product Specifications

• Part Number: 19-EK5806A1
• Brand: Prox
• Weight: 23.2 lbs
• UPC: 193564435118

Available at Knobtown Cycle

Order online or stop by our Kansas City location. Kansas City riders since 2004!

Part Locations

Stock levels last updated: March 1, 2026 5:07 PM

Professional Installation Available

Knobtown Cycle offers professional installation services. Contact us via a service request to learn more.