726M05400 Wiseco Std Piston Kit for Yamaha YZ125 1998-2001 54.00 mm

Wiseco Std Piston Kit for Yamaha YZ125

This Wiseco standard bore piston kit for Yamaha YZ125 keeps 1998 to 2001 models running at stock displacement, cross referencing 726M05400 and a 54.00mm bore size.

Overview

This standard bore piston kit for Yamaha YZ125 delivers a direct stock replacement for 1998 through 2001 models that need a fresh top end without cylinder boring. The 54.00mm kit restores sealing and compression so the engine runs clean and pulls hard again. It suits riders and shops handling top end service on 125cc two stroke motocross machines.

Built For Performance

• Forged piston construction for durability at high engine speeds
• Standard 54.00mm bore size for direct stock replacement
• Kit includes piston, rings, wrist pin, and circlips for a full top end refresh
• Cross references 726M05400 for easy parts matching
• Built for the 1998 to 2001 Yamaha YZ125 engine platform
• Precision machined ring grooves for consistent sealing and compression

Fits These Machines

• for Yamaha YZ125 1998
• for Yamaha YZ125 1999
• for Yamaha YZ125 2000
• for Yamaha YZ125 2001

On-The-Job Use

• Stock bore top end rebuilds after ring wear or compression loss
• Routine maintenance on a race season two stroke motocross bike
• Refreshing a trail ridden YZ125 before the next ride
• Replacing a damaged piston when the cylinder still measures in spec

Specs At A Glance

Good To Know

Q: Does this kit need cylinder boring? A: No, a standard bore piston is made for a cylinder that still measures within stock spec, so check your bore before ordering.

Q: What comes in the kit? A: A Wiseco piston kit of this type typically includes the piston, rings, wrist pin, and circlips needed for a top end rebuild.

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