SPI .040 Over Bore Piston Kit for Ski-Doo MXZ 670 HO & Summit X 670 HO 79mm

SPI .040 Over Bore Piston Kit for Ski-Doo MXZ 670 HO & Summit X 670 HO

This aftermarket piston kit provides a .040 over bore for Ski-Doo MXZ 670 HO and Summit X 670 HO snowmobiles, featuring a 79mm piston.

Overview

This SPI .040 over bore piston kit is built to refresh engine performance in Ski-Doo MXZ 670 HO and Summit X 670 HO models. It uses a 79mm bore to restore compression and power. Perfect for rebuilding high-output snowmobile engines.

Built For Performance

• Durable aluminum alloy construction withstands high RPM
• Precision-machined 79mm bore for exact fit
• .040 over sizing accommodates worn cylinders
• Includes piston rings and wrist pin for complete installation
• Engineered for the 670 HO engine platform

Fits These Machines

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

Specs At A Glance

Good To Know

Q: Will this kit work on other Ski-Doo models with the 670 engine? A: This piston kit is specifically designed for the MXZ 670 HO and Summit X 670 HO; other 670 models may have different bore specifications.

Q: Is a cylinder hone necessary when installing this piston? A: Yes, the cylinder should be honed to the correct finish for the new piston rings to ensure proper break-in and compression.

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