Namura .020 Over Bore Piston Rings for Polaris Big Boss 250 1989-1993 72.5mm

Namura .020 Over Bore Piston Rings for Polaris

These Namura .020 over bore piston rings for Polaris are engineered for cylinders that have been bored to 72.5mm to restore a factory-tight seal.

Overview

The Namura .020 over bore piston rings for Polaris are precision-machined to provide an exact fit for refurbished engine cylinders. These Namura .020 over bore piston rings for Polaris accommodate the increased diameter resulting from professional machine shop work. Choosing these Namura .020 over bore piston rings for Polaris ensures the engine maintains correct compression ratios and reliable power delivery.

Built For Performance

• Correct diameter for .020 oversized bores
• High quality sealing surface material
• Engineered for thermal expansion
• Restores factory level compression

Fits These Machines

• for Polaris Big Boss 250 1989-1993

On-The-Job Use

• Engine rebuilds involving cylinder boring
• Restoring performance after block refinishing
• Maintaining engine health in high-mileage units

Specs At A Glance

Good To Know

Q: Do I need a machine shop for these? A: These are for cylinders that have already been bored to 72.5mm by a machine shop.

Q: How do I confirm the size needed? A: Measure your current cylinder bore or check your piston top for sizing stamps before selecting rings.

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