2 SPI .010 Over Bore Piston Kits for Polaris 500 RMK fits 1997 1998 1999 72.25mm

2 Piston Kits (0.010 Over Bore) for Polaris 500 RMK

These two piston kits feature a 0.010 inch overbore and a 72.25mm bore diameter, designed to fit Polaris 500 RMK snowmobiles from 1997 to 1999.

Overview

These piston kits are aftermarket replacements for Polaris 500 RMK engines, offering a 0.010 inch overbore to refresh worn cylinders. Each set includes two pistons sized at 72.25mm, providing a direct fit for select 1997-1999 snowmobiles.

Built For Performance

• 0.010 inch overbore for worn cylinder restoration
• 72.25mm bore diameter for precise fit
• High-strength aluminum alloy construction
• Includes piston rings and wrist pins
• Matched set for balanced engine performance

Fits These Machines

• for Polaris 500 RMK 1997
• for Polaris 500 RMK 1998
• for Polaris 500 RMK 1999

On-The-Job Use

• Used in snowmobile engine rebuilds
• Ideal for high-altitude riding and deep powder
• Commonly installed during top-end overhauls
• Works with stock or modified intake/exhaust

Specs At A Glance

Good To Know

Q: Are these pistons cast or forged? A: These are high-quality cast pistons commonly used in OEM replacement applications, offering good durability and thermal stability.

Q: Do I need to re-bore the cylinder to use these overbore pistons? A: Yes, a 0.010 inch overbore requires the cylinder to be professionally honed to the correct size for proper ring seal.

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