Namura .060 Over Bore Piston Kit for Polaris 300 Xplorer, Xpress, Big Boss 76mm

.060 Over Bore Piston Kit for Polaris

This piston kit is a direct replacement for Polaris 300 Xplorer, Xpress, and Big Boss ATVs, featuring a .060 over bore (76mm) to restore engine compression and power after wear or boring.

Overview

The .060 over bore piston kit for Polaris 300 series ATVs is engineered to rebuild engines that have been bored to 76mm, providing a precise fit and reliable performance. This kit includes the piston, rings, and wrist pin for a complete top-end overhaul.

Built For Performance

• High-strength aluminum alloy construction for durability
• Precision-machined piston skirt reduces friction
• Moly-coated rings for improved sealing and longevity
• Includes wrist pin and circlips for hassle-free installation
• Designed for .060 over bore applications (76mm diameter)

Fits These Machines

• for Polaris 300 Xplorer
• for Polaris Xpress
• for Polaris Big Boss

On-The-Job Use

• Engine rebuild after top-end wear or cylinder damage
• Restoring lost power in aging ATVs
• Trail riding and utility work requiring reliable engine performance

Specs At A Glance

Good To Know

Q: Do I need to replace the cylinder sleeve? A: This piston kit is designed for a cylinder already bored to .060 over; if your cylinder needs boring, have it machined to 76mm before installation.

Q: Does this kit include the piston rings? A: Yes, the kit comes complete with piston rings and a wrist pin for a full top-end rebuild.

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