SPI .020 Over Bore Piston Kit for Polaris 500 RMK fits 1997 1998 1999 72.5mm

SPI .020 Over Bore Piston Kit for Polaris

This SPI .020 over bore piston kit is designed for Polaris 500 RMK snowmobiles from 1997 to 1999, featuring a 72.5mm bore for increased displacement and performance.

Overview

This piston kit from SPI provides a .020 over bore option for Polaris 500 RMK engines, allowing engine rebuilds with a larger bore. It includes piston, rings, and wrist pin for a complete top-end refresh.

Built For Performance

• Precisely machined from high-strength aluminum alloy
• .020 over bore increases displacement for more power
• Includes high-quality piston rings for proper sealing
• Designed to withstand high RPM and load conditions
• Direct fit for Polaris 500 RMK with 72.5mm bore

Fits These Machines

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

On-The-Job Use

• Snowmobile trail riding and racing
• Engine rebuilds and performance upgrades
• High-altitude riding requiring increased compression

Specs At A Glance

Good To Know

Q: Is this piston kit compatible with stock cylinder? A: Yes, when boring the cylinder to 72.5mm, this kit can be used with the stock cylinder after machining.

Q: Do I need to replace wrist pin bearings? A: This kit includes a new wrist pin and circlips; it is recommended to also replace the connecting rod bearing during rebuild.

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