SPI .030 Over Bore Piston Kit for Polaris 500 Snow fits 1985-2006 488cc 72.75mm

.030 Over Bore Piston Kit for Polaris

This .030 over bore piston kit for Polaris 500 Snow engines is designed for 488cc models from 1985 to 2006, featuring a 72.75mm bore size for a precise fit.

Overview

This .030 over bore piston kit for Polaris 500 Snow sleds provides a replacement piston and rings for engines requiring an oversized bore. It is intended for 1985-2006 488cc Polaris engines, offering a 72.75mm piston diameter. By using this over bore piston kit, you can restore engine performance and compression after cylinder wear.

Built For Performance

• Piston diameter 72.75mm (.030 over standard bore)
• Includes piston rings for proper sealing
• Manufactured by SPI, a reliable aftermarket supplier
• Casting is precision-machined to reduce friction and wear
• Compatible with stock connecting rods and wrist pins
• Designed to withstand high RPM snowmobile operation

Fits These Machines

• for Polaris 500 Snow (1985-2006, 488cc)

On-The-Job Use

• Used during top end rebuilds on Polaris 500 Snow snowmobiles
• Ideal for restoring lost compression in high-mileage engines
• Commonly installed when boring cylinders to .030 over size
• Suitable for both trail and performance riding applications

Specs At A Glance

Good To Know

Q: Does this piston kit include a wrist pin? A: This kit includes the piston and rings only; you will need to reuse your existing wrist pin or purchase it separately if damaged.

Q: Can this piston be used in a standard bore cylinder? A: No, this is a .030 over bore piston and requires the cylinder to be bored to 72.75mm; it will not fit a standard bore.

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