435M05800 Wiseco Piston Kit .080 for Yamaha YZ125 1976-1982 58.00 mm

Wiseco .080 Piston Kit for Yamaha YZ125

This Wiseco .080 overbore piston kit for Yamaha YZ125 supports 1976 through 1982 models, and with the 435M05800 cross reference and 58.00 mm bore size, it gives worn or bored-out cylinders a fresh top end option.

Overview

This Wiseco .080 Piston Kit for Yamaha YZ125 is an overbore replacement piston for 1976-1982 engines that have been bored beyond standard size. The 58.00 mm diameter matches a .080 overbore, letting riders restore compression on cylinders that need more than a standard piston. The 435M05800 reference helps confirm the piston kit matches the intended YZ125 application.

Built For Performance

• .080 overbore size with a 58.00 mm bore diameter
• Wiseco forged piston construction for high-rpm two-stroke use
• Kit includes piston, rings, wrist pin, and circlips for a full top end rebuild
• Designed for 1976-1982 Yamaha YZ125 engines
• 435M05800 part number for accurate cross-referencing
• Precision machining promotes reliable cylinder sealing and compression

Fits These Machines

• for Yamaha YZ125 1976
• for Yamaha YZ125 1977
• for Yamaha YZ125 1978
• for Yamaha YZ125 1979
• for Yamaha YZ125 1980
• for Yamaha YZ125 1981
• for Yamaha YZ125 1982

On-The-Job Use

• Top end rebuilds on YZ125 engines with a bored-out cylinder
• Vintage motocross restoration projects for 1976-1982 Yamaha two-strokes
• Refreshing compression after cylinder work
• Routine piston and ring service on modified engines

Specs At A Glance

Good To Know

Q: When should I use a .080 overbore piston kit? A: It is intended for cylinders that have been bored to a 58.00 mm size, typically after wear or damage. Confirm your cylinder bore matches before ordering.

Q: Does this kit fit a stock YZ125 cylinder? A: A .080 overbore piston requires the cylinder to be bored to match the 58.00 mm size. Verify your cylinder dimensions and serial number to ensure correct fitment.

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