Namura Standard Bore Top End Kit for Polaris Trail Boss 250 1985-1999 72mm

Namura Standard Bore Top End Kit for Polaris Trail Boss 250 1985-1999 72mm

This top end kit provides all components needed to rebuild the cylinder of a Polaris Trail Boss 250 (1985-1999) with standard bore 72mm piston, restoring engine performance.

Overview

The Namura Standard Bore Top End Kit is designed for the Polaris Trail Boss 250 models produced from 1985 to 1999. It includes a 72mm piston, rings, wrist pin, circlips, and gaskets to replace worn top-end parts. This kit is ideal for maintaining the original bore size and getting your ATV back on the trail.

Built For Performance

• Standard 72mm piston for factory specification rebuilds
• Durable cast aluminum construction matched to OEM tolerances
• Precision-ground ring set for consistent compression
• Includes wrist pin and circlips for secure piston attachment
• Complete gasket set for a reliable seal

Fits These Machines

• for Polaris Trail Boss 250 (1985-1999)

On-The-Job Use

• Rebuilding top end of a Polaris Trail Boss 250 engine
• Restoring compression and power after normal wear
• Maintaining a stock bore ATV for recreational or utility use
• Performing a preventive top-end refresh on older models

Specs At A Glance

Good To Know

Q: Does this kit work on other Polaris 250 2-stroke models? A: This kit is specifically designed for the Polaris Trail Boss 250; other models may require a different piston size or stroke, so always confirm your engine specifications.

Q: Is the cylinder head included? A: No, this is a top end repair kit that includes piston, rings, pin, clips, and gaskets; cylinder head and cylinder must be reused or sourced separately.

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