Namura Standard Bore Size C Top End Repair Kit for Yamaha YZ125 1998-2000 54mm

Namura Standard Bore Size C Top End Repair Kit for Yamaha

This top end repair kit for Yamaha YZ125 models from 1998 to 2000 includes piston, rings, wrist pin, and bearings for rebuilding the cylinder with a standard 54mm bore size.

Overview

This Namura Standard Bore Size C Top End Repair Kit is a complete rebuild solution for Yamaha YZ125 top ends. It restores compression and performance by replacing worn components with precision-fit parts designed for stock bore dimensions. Ideal for riders seeking reliable OEM-spec replacement without oversizing the cylinder.

Built For Performance

• Includes forged piston for high-strength and thermal stability
• Chrome-plated top ring reduces friction and wear
• Needle bearing wrist pin cage for smooth operation
• Complete gasket set ensures leak-free assembly
• Precision-machined piston pin for exact fitment

Fits These Machines

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

On-The-Job Use

• Motocross racing and practice
• Trail and off-road riding
• Top end rebuild after 40-60 hours of use
• Competition engine maintenance

Specs At A Glance

Good To Know

Q: Does this kit include a wrist pin bearing and circlips? A: Yes, the kit includes a wrist pin bearing and circlips for complete installation.

Q: Is this kit suitable for a standard bore cylinder? A: Yes, this kit is designed for standard bore size C, the stock size for 1998-2000 YZ125.

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