222M04750 Wiseco .020 Piston Kit 47.50 mm for Yamaha YZ80 TY80 1974-1975

Piston Kit for Yamaha YZ80 & TY80

This Wiseco 222M04750 piston kit is a 47.50 mm oversize piston assembly that restores compression and top-end performance on Yamaha YZ80 and TY80 models from 1974 to 1975, with the 0.020 in. oversize bore for cylinders that need a cleanup.

Overview

This Wiseco piston kit for Yamaha YZ80 and TY80 machines is a 47.50 mm oversize top-end component built to refresh a worn cylinder bore. The 222M04750 kit pairs a forged piston with rings, wrist pin, and circlips so the YZ80 or TY80 top end can be rebuilt in one job. It suits riders and mechanics reviving older two-stroke machines that need a reliable oversize piston kit.

Built For Performance

• Wiseco forged piston construction for strength under two-stroke combustion loads
• 0.020 in. oversize 47.50 mm bore size to match a refinished cylinder
• Kit includes piston, rings, wrist pin, and circlips for a complete top-end refresh
• Engineered for the Yamaha YZ80 and TY80 1974 to 1975 applications
• Oversize sizing restores proper piston-to-cylinder clearance after boring

Fits These Machines

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

On-The-Job Use

• Top-end rebuilds on vintage YZ80 motocross bikes
• TY80 trials machine engine refresh and restoration projects
• Cylinder rebore jobs that require an oversize piston
• Workshop repairs where compression has dropped from piston wear

Specs At A Glance

Good To Know

Q: Does this piston kit fit a standard bore cylinder? A: No, this is a 47.50 mm oversize piston, so the cylinder must be bored and honed to match before installation. Check your current bore size and piston clearance spec first.

Q: What is included in the kit? A: The kit includes the piston along with rings, wrist pin, and circlips for a complete top-end assembly. Verify all components against your machine before assembly.

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