Namura .020 Over Bore Top End Repair Kit for Polaris Ranger 150 & ACE 150 57.9mm

Namura .020 Over Bore Top End Repair Kit for Polaris

This top end repair kit from Namura provides a .020 over bore piston and rings for Polaris Ranger 150 and ACE 150 engines, measuring 57.9mm. It is designed to restore compression and performance after cylinder wear.

Overview

The Namura .020 over bore top end repair kit is a direct replacement for worn piston and ring assemblies in Polaris Ranger 150 and ACE 150 models. It includes a 57.9mm piston with rings and wrist pin, allowing rebuilding of the cylinder head for improved power and reliability. This kit is an economical solution for engine refurbishment.

Built For Performance

• Oversized .020 over for machining out cylinder wear
• 57.9mm piston diameter matches standard overbore specification
• Includes piston rings and wrist pin for a complete top end rebuild
• Manufactured by Namura, a trusted aftermarket supplier
• Precision-machined to close tolerances for reliable sealing

Fits These Machines

• for Polaris Ranger 150
• for Polaris ACE 150

On-The-Job Use

• Used for rebuilding engines in Polaris utility vehicles and recreational side-by-sides
• Commonly employed during top end overhauls to restore lost compression
• Ideal for owners restoring or modifying Polaris 150cc engines
• Essential for mechanics servicing Polaris Ranger and ACE models

Specs At A Glance

Good To Know

Q: Do I need to machine my cylinder to use this overbore kit? A: Yes, this .020 over kit requires the cylinder to be bored and honed to match the 57.9mm piston size for proper clearance.

Q: Are the rings pre-gapped? A: The rings are standard and may need final gap adjustment during installation to meet manufacturer specifications.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.