646M04900 Wiseco Piston Kit for Yamaha YZ80 1993-2000 49.00 mm .080

Wiseco .080 Piston Kit for Yamaha YZ80

This Wiseco .080 oversize piston kit for Yamaha YZ80 models is an engine rebuild component that restores compression and top-end power, and it cross-references part 646M04900 with a 49.00 mm bore.

Overview

This Wiseco piston kit for Yamaha YZ80 is a complete top-end replacement built for racers and mechanics rebuilding worn two-stroke engines. The kit delivers the 49.00 mm oversize bore needed to clean up a scored or out-of-spec cylinder, and it pairs with part 646M04900 so you can match it to your build. It suits anyone restoring or maintaining a YZ80 that needs dependable compression back in the top end.

Built For Performance

• Forged high-silicon aluminum construction for strength under heat and load
• Oversize 0.080 bore at 49.00 mm to correct worn cylinder dimensions
• Precision-machined ring grooves for consistent ring seating
• Kit format includes piston, rings, pin, and clips for a complete rebuild
• Engineered tolerances suited to two-stroke performance demands

Fits These Machines

• for Yamaha YZ80, 1993-2000

On-The-Job Use

• Top-end rebuild after a seized or scored piston
• Routine refresh on a high-hour motocross engine
• Restoration projects bringing an older race bike back to life
• Bore correction when the cylinder needs an oversize cleanup

Specs At A Glance

Good To Know

Q: Does this kit include everything needed for the top end? A: It ships as a piston kit with the piston, rings, wrist pin, and clips so the rebuild parts are on hand. Always check bore condition and clearance before install.

Q: Will the 0.080 oversize fit my stock cylinder? A: No, an oversize piston requires the cylinder to be bored and honed to match the 49.00 mm size. Confirm your machine's current bore and serial number before ordering.

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