Namura .060 Over Bore Piston Kit for Polaris 1990-1993 350 2-Stroke ATV's 81.5mm

Namura .060 Over Bore Piston Kit for Polaris

This Namura .060 over bore piston kit is a direct replacement piston assembly for Polaris 350cc 2-stroke ATV engines from 1990 to 1993, featuring an 81.5mm bore size to restore compression and performance.

Overview

The Namura .060 over bore piston kit is designed for Polaris 350cc 2-stroke ATVs, offering an 81.5mm oversized piston to renew worn cylinders. It provides a reliable rebuild option for vintage Polaris 350 ATV engines, ensuring strong power delivery and longevity. This piston kit is ideal for enthusiasts restoring or maintaining their Polaris 1990-1993 350 2-stroke ATVs.

Built For Performance

• Oversized .060 over bore piston for increased displacement and compression
• Premium aluminum alloy construction for strength and heat dissipation
• Precision-machined 81.5mm diameter for accurate fit
• Includes piston rings and wrist pin for complete installation
• Designed for Polaris 350cc 2-stroke engines
• Direct replacement without modification in compatible engines

Fits These Machines

• for Polaris 350 2-Stroke ATV (1990-1993)

On-The-Job Use

• Trail riding and recreational ATV use
• Mudding and off-road adventures
• Restoration of vintage Polaris 350 ATVs
• Engine rebuilds and overhauls

Specs At A Glance

Good To Know

Q: Do I need to replace the cylinder with this piston kit? A: Typically the cylinder can be re-used if it is within spec for the .060 overbore, but you should have it honed or bored to match the new piston size.

Q: Will this piston kit work with the original Polaris head gasket? A: The original head gasket may still be used, but we recommend replacing it with a new one during the rebuild for a proper seal.

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