222M04800 Wiseco .040 Piston Kit 48.00 mm for Yamaha YZ80 TY80 1974-1975

Piston Kit for Yamaha YZ80 & TY80

This Wiseco 222M04800 piston kit, sized 48.00 mm and marked .040 oversize, is a rebuild component for vintage Yamaha YZ80 and TY80 engines from 1974-1975, restoring bore fit and compression in a worn top end.

Overview

This 48.00 mm piston kit is a top-end rebuild option for the 1974-1975 Yamaha YZ80 and TY80. The .040 oversize piston works with a freshly bored cylinder to restore a proper piston-to-wall clearance. Riders and restorers rebuilding these classic small-bore engines get a direct-fit piston kit for the job.

Built For Performance

• .040 oversize, 48.00 mm piston sized for a rebored cylinder
• Wiseco 222M04800 part number for straightforward identification
• Piston kit format covering the piston and matching components
• Built for the 1974-1975 Yamaha YZ80 and TY80 two-stroke top end
• Machined piston body for consistent ring land and skirt geometry

Fits These Machines

• for Yamaha YZ80, 1974-1975
• for Yamaha TY80, 1974-1975

On-The-Job Use

• Top-end rebuilds on tired 1974-1975 YZ80 and TY80 engines
• Restoration projects returning a worn cylinder to service
• Bore-up repair after cylinder wear or scoring
• Vintage motocross and trials engine refresh work

Specs At A Glance

Good To Know

Q: Does this piston kit drop into a stock cylinder? A: No, the .040 oversize sizing means the cylinder must be bored to match the 48.00 mm piston before assembly. Confirm the required bore clearance with your machinist.

Q: Will this fit every year of the YZ80 and TY80? A: The kit is listed for the 1974-1975 YZ80 and TY80 models. Check your engine serial number and current bore size to confirm it suits your build.

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