SPI .010 Over Bore Piston Kit for Ski-Doo MXZ 670 HO & Summit X 670 HO 78.25mm

SPI .010 Over Bore Piston Kit for Ski-Doo

The SPI .010 over bore piston kit rebuilds Ski-Doo snowmobile engines with an oversized 78.25mm piston for MXZ 670 HO and Summit X 670 HO models.

Overview

This SPI .010 over bore piston kit is designed for Ski-Doo MXZ 670 HO and Summit X 670 HO snowmobiles. It provides a precise 78.25mm bore diameter to restore engine compression and performance. The kit includes a piston, rings, wrist pin, and circlips for a complete rebuild.

Built For Performance

• High-strength aluminum alloy piston for durability
• Precision-machined ring grooves ensure proper sealing
• Oversized 78.25mm bore increases displacement for more power
• Includes wrist pin and circlips for easy installation
• Designed to meet OEM specifications for reliable fit

Fits These Machines

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

On-The-Job Use

• Restores engine performance on trail and mountain snowmobiles
• Ideal for high-mileage engines needing a rebuild
• Commonly used in racing and recreational riding
• Provides a cost-effective alternative to new engine replacement

Specs At A Glance

Good To Know

Q: What is the advantage of an over bore piston kit? A: An over bore piston kit lets you machine the cylinder to a larger diameter, restoring compression and extending engine life without replacing the entire engine.

Q: Do I need to rejet the carburetor after installing this kit? A: Yes, you may need to adjust jetting to accommodate the increased displacement and ensure proper fuel-air mixture.

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