Namura .040 Over Bore Top End Repair Kit fits Polaris 250 2-Stroke ATV's 73mm

.040 Over Bore Top End Repair Kit for Polaris

This .040 over bore top end repair kit is designed to rebuild the cylinder of Polaris 250 2-stroke ATV engines with a 73mm bore. It provides the necessary parts for a complete top end overhaul on these utility machines.

Overview

This .040 over bore top end repair kit is a complete set for rebuilding the upper cylinder of Polaris 250 2-stroke ATVs. The 73mm piston, rings, pin, and gaskets allow you to refresh a worn or damaged cylinder. It restores compression and power for continued off-road use.

Built For Performance

• 73mm .040 over bore piston for increased displacement
• Includes high-strength rings for reliable sealing
• Kit contains cylinder base gasket and head gasket
• Designed to match original Polaris 250 2-stroke specifications
• Precision cast piston provides smooth operation

Fits These Machines

• for Polaris 250 2-Stroke ATV

On-The-Job Use

• Used when boring cylinder to .040 over size to remove damage
• Ideal for restoring Polaris 250 engines in ATVs and utility vehicles
• Suitable for recreational trail riding and farm tasks
• Commonly installed during a full engine rebuild project

Specs At A Glance

Good To Know

Q: Do I need to have the cylinder bored to use this kit? A: Yes, the cylinder must be machined to .040 over size (73mm) to fit this piston. A machine shop can perform this service.

Q: Will this kit work for other Polaris 250 models? A: This kit is designed for Polaris 250 2-stroke ATV engines. Confirm your engine serial number for compatibility.

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