2 SPI .040 Over Bore Piston Kits fits Ski-Doo MXZ 670 HO & Summit X 670 HO 79mm

SPI .040 Over Bore Piston Kits for Ski-Doo

These two SPI .040 over bore piston kits provide a high-performance replacement for Ski-Doo MXZ 670 HO and Summit X 670 HO snowmobiles, featuring a 79mm bore size for increased displacement and power.

Overview

These SPI .040 over bore piston kits are designed to restore or enhance engine performance in compatible Ski-Doo two-stroke engines. Each kit includes two pistons with rings and wrist pins, allowing a precise .040 oversize fit for a fresh cylinder bore. They are ideal for rebuilding an MXZ 670 HO or Summit X 670 HO engine.

Built For Performance

• Manufactured from high-strength aluminum alloy for durability
• Precision-machined to .040 over bore specification for accurate fitment
• Includes complete ring set for proper compression and oil control
• Wrist pin and circlips included for straightforward installation
• Balanced to reduce vibration at high RPM

Fits These Machines

• for Ski-Doo MXZ 670 HO
• for Ski-Doo Summit X 670 HO

On-The-Job Use

• Snowmobile engine rebuilds
• Performance restoration for high-output two-stroke motors
• Trail riding and mountain riding applications
• Competitive snowmobiling where power matters

Specs At A Glance

Good To Know

Q: Can these piston kits be used in other Ski-Doo models? A: They are specifically designed for the MXZ 670 HO and Summit X 670 HO; other models may require different bore sizes or piston configurations.

Q: Do the kits come with everything needed for installation? A: Yes, each kit includes pistons, rings, wrist pins, and circlips, though you should also plan to replace gaskets and seals separately.

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