559M05600 Wiseco Std Piston Kit for Yamaha YZ125 1986-1988 56.00 mm

Piston Kit for Yamaha YZ125

This Wiseco standard bore piston kit for Yamaha YZ125 fits 1986 through 1988 models, with a 56.00 mm piston carrying OEM cross reference 559M05600.

Overview

This Wiseco standard piston kit for Yamaha YZ125 is a top end rebuild component that replaces the factory piston and rings to restore compression and performance. The 56.00 mm standard bore size keeps the cylinder at stock dimensions for 1986 to 1988 YZ125 engines. Riders and mechanics doing a routine top end service will find this piston kit matches the original bore.

Built For Performance

• Wiseco forged piston construction for durability in two stroke motocross engines
• Standard 56.00 mm bore size for stock cylinders without overboring
• Kit includes piston, rings, wrist pin, and circlips for a complete top end job
• Cross reference 559M05600 identifies the exact application
• Precision machined skirt and ring grooves for a consistent seal

Fits These Machines

• for Yamaha YZ125 1986
• for Yamaha YZ125 1987
• for Yamaha YZ125 1988

On-The-Job Use

• Stock bore top end rebuilds after piston wear or seizure
• Compression refresh on a high hour two stroke
• Routine engine maintenance between race seasons
• Replacing a worn piston while keeping the original cylinder

Specs At A Glance

Good To Know

Q: Will this piston fit a cylinder that has already been overbored? A: No, this is a standard 56.00 mm piston, so it only suits a cylinder still at stock bore dimensions.

Q: What is included in the kit? A: Wiseco piston kits of this type typically include the piston, rings, wrist pin, and circlips, so verify contents with the listing 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.