520M04850 Wiseco .020 Oversize Piston Kit 48.50mm for Yamaha YZ80 1985-1987

Wiseco .020 Piston Kit for Yamaha YZ80

This Wiseco .020 piston kit for Yamaha YZ80 restores top end compression on 1985 through 1987 models, and the 48.50 mm bore size cross references OEM part 520M04850.

Overview

This Wiseco .020 piston kit is a top end rebuild component for the Yamaha YZ80 built from 1985 to 1987. The 48.50 mm piston works with a .020 oversize bore, letting a worn or scored cylinder be refinished and returned to service. It suits riders and mechanics rebuilding a YZ80 minis bike top end.

Built For Performance

• .020 oversize bore sizing for refinished cylinders
• 48.50 mm piston diameter
• Wiseco forged piston construction
• Kit format for a complete top end rebuild
• Cross references OEM 520M04850

Fits These Machines

• for Yamaha YZ80 1985
• for Yamaha YZ80 1986
• for Yamaha YZ80 1987

On-The-Job Use

• Top end rebuilds after cylinder scoring or seizure
• Oversize bore correction on worn cylinders
• Motocross and trail maintenance on YZ80 minis
• Shop rebuilds where a matched piston and ring set is needed

Specs At A Glance

Good To Know

Q: What does .020 oversize mean for my cylinder? A: It means the cylinder must be bored and honed to match the 48.50 mm piston, so measure your bore before ordering. Q: Is this piston kit a direct fit? A: It is built for Yamaha YZ80 1985 to 1987 applications, but confirming your model year and current bore size is recommended.

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