SPI Standard Bore Piston Kit for Ski-Doo fits 1993-1999 670 non-HO Sleds 78mm

Standard Bore Piston Kit for Ski-Doo

This Standard Bore Piston Kit for Ski-Doo fits 670 non-HO snowmobile engines from 1993 to 1999, featuring a 78mm bore size to restore compression and performance in these classic sleds.

Overview

This Standard Bore Piston Kit is a direct replacement for Ski-Doo 670 non-HO snowmobile engines manufactured between 1993 and 1999. It includes a precision-cast piston, rings, and wrist pin, delivering reliable power for high-mileage or rebuild applications. The 78mm bore matches factory specifications for these two-stroke engines.

Built For Performance

• High-strength aluminum alloy piston for durability in snowmobile conditions
• Precision-ground rings for optimal cylinder sealing
• Includes wrist pin and circlips for complete installation
• 78mm standard bore size ensures proper fit without cylinder machining
• Designed for high-RPM two-stroke engine operation

Fits These Machines

• for Ski-Doo 670 non-HO snowmobiles (1993-1999)

On-The-Job Use

• Rebuilding top end of Ski-Doo 670 non-HO engines
• Replacing worn pistons to restore lost compression and power
• Performing routine engine overhaul for reliable winter riding
• Restoring vintage Ski-Doo snowmobiles to running condition

Specs At A Glance

Good To Know

Q: Does this piston kit work with the HO version of the 670? A: This kit is specifically for the non-HO 670 engine; the HO version uses a different piston design and is not compatible.

Q: Are the piston rings pre-gapped? A: Rings are not pre-gapped; final gap should be checked and adjusted according to manufacturer specifications during installation.

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