Namura Standard Bore Size B Top End Repair Kit for Yamaha YZ250 1999-2001 66.4mm

Namura Standard Bore Size B Top End Repair Kit for Yamaha

This Namura Standard Bore Size B Top End Repair Kit is a complete top-end rebuild kit for Yamaha YZ250 models from 1999 to 2001, featuring a 66.4mm bore size and including piston, rings, wrist pin, and clips.

Overview

The Namura Standard Bore Size B Top End Repair Kit provides everything needed to refresh the top end of a Yamaha YZ250. It includes a precision-machined piston with rings, a wrist pin, and clips, all designed to meet OEM standards. This top end kit is a direct replacement for Yamaha YZ250 models from 1999-2001, ensuring optimal performance and longevity.

Built For Performance

• Includes a forged aluminum piston for strength and light weight
• Features a chrome-plated ring set for reduced friction
• Wrist pin and clips pre-installed for quick installation
• Manufactured to exacting tolerances for a perfect fit
• Compatible with standard bore size B (66.4mm)

Fits These Machines

• for Yamaha YZ250 1999-2001

On-The-Job Use

• Used during top-end rebuilds for motocross and off-road racing
• Ideal for restoring lost compression and power
• Commonly installed by riders and mechanics to maintain peak engine performance
• Essential for competitive racing and recreational riding

Specs At A Glance

Good To Know

Q: What is included in the top end kit? A: The kit includes a piston, rings, wrist pin, and clips, all pre-assembled for easy installation.

Q: What is the bore size? A: This kit is for standard bore size B, which is 66.4mm for Yamaha YZ250 models from 1999-2001.

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