2284M06800 Wiseco Piston Kit 68.00mm for Yamaha SS440 1980-1981 Std Bore

Piston Kit for Yamaha SS440

This Wiseco standard bore piston kit with part number 2284M06800 restores compression in 1980-1981 Yamaha SS440 snowmobile engines at a 68.00 mm bore size.

Overview

This piston kit is a standard bore replacement made for the 1980-1981 Yamaha SS440 engine. It renews top end sealing after wear or seizure, restoring the compression these snowmobile pistons are designed to deliver. Riders and mechanics rebuilding a tired SS440 top end will find this kit a direct-fit solution for the 68.00 mm cylinder.

Built For Performance

• Wiseco forged piston construction for strength under high rpm loads
• Standard 68.00 mm bore size matches the original cylinder spec
• Kit includes piston, rings, wrist pin, and circlips for a complete top end refresh
• Designed for the 1980-1981 Yamaha SS440 engine platform
• Precision machined skirt and ring grooves for consistent sealing

Fits These Machines

• for Yamaha SS440 1980
• for Yamaha SS440 1981

On-The-Job Use

• Top end rebuilds after piston seizure or low compression
• Routine engine freshening on vintage snowmobiles
• Restoration projects bringing an SS440 back to running condition
• Trail sled maintenance before the riding season

Specs At A Glance

Good To Know

Q: Does this kit include rings and pin? A: Yes, this Wiseco piston kit ships as a complete assembly with piston, rings, wrist pin, and circlips. Confirm your cylinder measures at the standard 68.00 mm bore before installing.

Q: Can I install this without machining the cylinder? A: This standard bore piston fits a cylinder still within factory spec, so measure bore wear and taper first. If the cylinder is scored or oversized, a bore job and matching oversize piston may be required instead.

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