Namura .020 Over Bore Piston Rings for Polaris Trail Boss 250 1985-1999 72.5mm

.020 Over Bore Piston Rings for Polaris

These Namura .020 over bore piston rings for Polaris Trail Boss 250 are engineered for 72.5mm cylinders to restore proper compression in 1985-1999 engines. These piston rings for Polaris are designed to provide a secure seal between the piston and cylinder wall.

Overview

The Namura .020 over bore piston rings for Polaris serve as a replacement set for engine rebuilds or performance maintenance. These precision-manufactured piston rings for Polaris ensure reduced blow-by and improved combustion efficiency. They are intended for engine builders working on 250cc two-stroke machines.

Built For Performance

• Durable material for high-heat resilience
• Engineered for .020 overbore applications
• Maintains consistent cylinder pressure
• Standard gap design for optimal expansion
• Engineered for long-term reliability

Fits These Machines

• for Polaris Trail Boss 250 1985-1999

On-The-Job Use

• Top-end engine rebuilds
• Restoring compression in aging engines
• General mechanical overhaul

Specs At A Glance

Good To Know

Q: Do I need to hone the cylinder? A: Yes, a fresh crosshatch pattern on the cylinder wall is necessary to ensure the rings seat correctly during break-in. A: Failure to prepare the cylinder surface can lead to poor sealing.

Q: Are these rings for standard bore? A: No, these are specifically sized for an .020 overbore condition.

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