2 SPI .020 Over Bore Piston Kits for Polaris XC 500, XC SP, RMK, Classic 71mm

SPI .020 Over Bore Piston Kits for Polaris

These SPI .020 over bore piston kits are replacement pistons for Polaris XC 500, XC SP, RMK, and Classic snowmobiles, restoring engine performance with a 71mm bore size.

Overview

These SPI piston kits are manufactured to exact specifications for Polaris 500cc engines, providing a direct fit for models including XC 500, XC SP, RMK, and Classic. With a 0.020 oversize and 71mm bore, these piston kits ensure proper compression and reliable power delivery for high-mileage engine rebuilds.

Built For Performance

• 0.020 over bore size accommodates worn cylinder walls
• High-strength aluminum alloy construction for durability
• Precision-machined ring grooves for optimal seal
• Includes wrist pins and circlips for complete installation
• Designed for use with standard fuel and oil mixtures

Fits These Machines

• for Polaris XC 500
• for Polaris XC SP
• for Polaris RMK
• for Polaris Classic

On-The-Job Use

• Trail riding and recreational snowmobiling
• Engine rebuilds due to wear or damage
• Performance restoration of older Polaris models
• Backup sled maintenance and repairs

Specs At A Glance

Good To Know

Q: Are these piston kits compatible with both liquid-cooled and fan-cooled Polaris engines? A: These kits are designed for specific Polaris 500cc models listed; always confirm your engine type and serial number before ordering.

Q: Do these pistons require any special break-in procedure? A: Yes, follow standard two-stroke break-in guidelines with proper fuel mixture and avoid sustained full throttle for the first few hours of operation.

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