2 SPI .020 Over Bore Piston Kits fits Arctic Cat Many 1976-1988 500 Sleds 70.5mm

2 SPI .020 Over Bore Piston Kits for Arctic Cat

This set of two over bore piston kits, sized at 70.5mm, provides replacement pistons for many 1976-1988 Arctic Cat 500 snowmobile engines.

Overview

These SPI piston kits are designed for .020 over bore applications in Arctic Cat 500 series snowmobiles, offering a direct fit for rebuilding engines across multiple model years from 1976 through 1988. Each kit includes the piston, rings, wrist pin, and circlips, delivering a complete solution for restoring compression and performance.

Built For Performance

• Machined from high-strength aluminum alloy for durability and heat resistance
• .020 over bore (70.5mm) corrects worn cylinder walls
• Precision-ground ring grooves ensure optimal ring seal
• Full floating wrist pin with circlips reduces friction
• Balanced design minimizes vibration under load

Fits These Machines

• for Arctic Cat 500 snowmobiles (1976-1988)

On-The-Job Use

• Engine rebuilding for vintage Arctic Cat sleds
• Restoration of 500cc two-stroke engines
• Performance restoration after cylinder overboring

Specs At A Glance

Good To Know

Q: Are these pistons compatible with standard bore cylinders? A: No, these are specifically for cylinders that have been bored 0.020 oversize; they will not fit standard bore dimensions.

Q: Do the kits include gaskets? A: No, these are piston-only kits; you will need a separate top-end gasket set for assembly.

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