Namura .060 Over Bore Piston Kit for Polaris Trail Boss 250 1985-1999 73.5mm

Namura .060 Over Bore Piston Kit for Polaris

This Namura .060 over bore piston kit is a direct replacement for Polaris Trail Boss 250 ATVs from 1985 to 1999, featuring a 73.5mm bore size for oversized engine rebuilding.

Overview

The Namura .060 over bore piston kit provides a complete piston assembly for Polaris Trail Boss 250 engines, designed to accommodate an oversized bore for cylinder resurfacing. This kit is ideal for rebuilding worn engines and restoring power, with a 73.5mm bore for a .060 over size. It is a reliable choice for ATV enthusiasts performing a top-end rebuild.

Built For Performance

• Manufactured from high-strength aluminum alloy for long life
• Includes piston, rings, wrist pin, and circlips for complete installation
• Precision machined to .060 over size (73.5mm) for resurfaced cylinders
• Designed to meet OEM specifications for Polaris 250cc engines
• Provides improved compression and engine efficiency

Fits These Machines

• for Polaris Trail Boss 250 (1985-1999)

On-The-Job Use

• Restores engine performance in worn Polaris Trail Boss 250 ATVs
• Commonly used in trail riding, utility work, and recreational ATV use
• Ideal for top-end rebuilds after cylinder boring to .060 over
• Helps extend engine life and maintain reliable power output

Specs At A Glance

Good To Know

Q: Will this piston kit work with my 1990 Polaris Trail Boss 250? A: Yes, this kit fits 1985-1999 models, but confirm your cylinder bore size and serial number before ordering to ensure proper fit.

Q: Do I need to bore the cylinder to use this kit? A: This .060 over piston kit requires the cylinder to be bored to 73.5mm, so professional machining is recommended before installation.

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