2 SPI .040 Over Bore Piston Kits for Ski-Doo Many 1989-1999 583 Sleds 77mm

2 SPI .040 Over Bore Piston Kits for Ski-Doo

These two SPI .040 over bore piston kits at 77mm size replace the original pistons in many Ski-Doo 583 sleds from 1989 to 1999, providing reliable compression and power for snowmobile engines.

Overview

This pair of SPI .040 over bore piston kits is designed for Ski-Doo 583 snowmobile engines from 1989 through 1999, using a 77mm bore diameter to restore top-end performance. Each kit includes the piston, rings, and wrist pin needed for a complete rebuild, making it a direct fit for many Ski-Doo models of that era.

Built For Performance

• Manufactured to .040 over bore specifications for precise cylinder matching
• 77mm piston diameter ensures proper clearance and compression
• Includes rings and wrist pin for a complete piston assembly
• Designed to handle the demands of high-rpm snowmobile operation
• Durable construction reduces wear and extends engine life

Fits These Machines

• for Ski-Doo 583 Sleds (1989-1999)

On-The-Job Use

• Ideal for rebuilding Ski-Doo snowmobile engines needing an overbore refresh
• Used in trail riding, racing, and recreational snowmobiling applications
• Commonly installed during top-end overhauls to restore lost compression
• Suitable for both stock replacement and performance rebuilds

Specs At A Glance

Good To Know

Q: What size overbore is this piston kit? A: This kit is .040 over bore, meaning it measures 77mm across the piston skirt for engines that have been bored to that size.

Q: Are these pistons compatible with stock Ski-Doo cylinders? A: No, because they are .040 over, the cylinder must be bored and honed to match the 77mm piston – stock cylinders are smaller.

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