Namura .020 Over Bore Piston Kit for Polaris Trail Blazer 250 1990-2006 72.5mm

Namura .020 Over Bore Piston Kit for Polaris Trail Blazer 250

This Namura .020 over bore piston kit is a direct replacement piston assembly for Polaris Trail Blazer 250 models from 1990 to 2006, featuring a 72.5mm bore diameter to restore compression and performance after cylinder overbore.

Overview

The Namura .020 over bore piston kit for Polaris Trail Blazer 250 provides a precision-machined piston with rings and pin, engineered to match the factory specifications for 1990-2006 Trail Blazer 250 engines. This overbore piston kit allows you to refresh your top end when standard bore is no longer viable, delivering reliable power and longevity for your Polaris ATV.

Built For Performance

• Precision-cast piston for consistent expansion and heat transfer
• Includes piston rings, wrist pin, and circlips for a complete top-end rebuild
• .020 inch oversize (72.5mm) compensates for cylinder wear
• Matching skirt profile reduces piston slap and noise
• Designed to meet or exceed OEM specifications for Polaris engines

Fits These Machines

• for Polaris Trail Blazer 250 (1990-2006)

On-The-Job Use

• Trail riding and recreational off-roading
• Utility and farm use requiring reliable engine performance
• Restoration of vintage Polaris Trail Blazer 250 quads
• Top-end rebuild during routine engine maintenance

Specs At A Glance

Good To Know

Q: Will this kit fit my Polaris Trail Blazer 250 if it has not been bored? A: This .020 over bore kit is intended for cylinders that have been bored 0.020 inch oversize; it will not fit a standard bore cylinder. Always measure your cylinder before ordering.

Q: Do I need any additional parts to complete the installation? A: You will need a new head gasket, base gasket, and possibly a new cylinder if wear exceeds the overbore limit. We recommend replacing the piston pin bearing at the same time.

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