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

SPI .040 Over Bore Top End Repair Kit 79mm for Ski-Doo

This SPI .040 Over Bore Top End Repair Kit provides pistons, rings, and gaskets needed to restore compression and performance on Ski-Doo MXZ 670 HO and Summit X models with 79mm cylinders.

Overview

The SPI .040 Over Bore Top End Repair Kit is designed to rebuild the top end of Ski-Doo snowmobile engines. This kit includes pistons, rings, wrist pins, and gaskets for a complete overhaul of 79mm cylinders. It is specifically intended for Ski-Doo MXZ 670 HO and Summit X sleds requiring a 0.040 overbore.

Built For Performance

• Includes 0.040 overbore pistons machined to precise tolerances
• High-quality ring set ensures optimal compression and oil control
• Complete gasket kit for a reliable seal during reassembly
• Wrist pins and circlips included for easy installation
• Designed to match OEM specifications for Ski-Doo 670 engines

Fits These Machines

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

On-The-Job Use

• Rebuilding the top end of a Ski-Doo snowmobile after high-mileage wear
• Restoring lost engine power caused by worn piston rings
• Performing a complete engine overhaul during off-season maintenance
• Repairing a blown top end from overheating or detonation

Specs At A Glance

Good To Know

Q: Will this kit fit a standard bore cylinder? A: No, this kit is designed for cylinders already bored 0.040 over; standard bore requires a different part number.

Q: Does the kit include all gaskets needed? A: Yes, the kit contains head gasket, base gasket, and all necessary seals for a complete top end rebuild.

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