Namura Standard Bore Size B Top End Repair Kit for Yamaha YZ250 1992-1994 68mm

Namura Standard Bore Size B Top End Repair Kit for Yamaha YZ250 1992-1994

This top end repair kit for Yamaha YZ250 models from 1992-1994 includes a piston, rings, pin, and gaskets to restore cylinder compression and performance.

Overview

The Namura Standard Bore Size B Top End Repair Kit for Yamaha YZ250 1992-1994 is a complete cylinder rebuild set designed to bring worn engines back to factory spec. This 68mm bore kit includes a cast piston, ring set, wrist pin, and top end gaskets. Ideal for riders restoring a YZ250 dirt bike from the early nineties.

Built For Performance

• Precision-cast piston for consistent expansion and long life
• Matched ring set for optimal cylinder seal
• Includes all required gaskets for a complete top end rebuild
• Standard bore size B (68mm) direct replacement for OEM components
• Designed for Yamaha YZ250 1992-1994 models

Fits These Machines

• for Yamaha YZ250 1992
• for Yamaha YZ250 1993
• for Yamaha YZ250 1994

On-The-Job Use

• Used to rebuild top end on YZ250 motocross bikes
• Restores lost power and compression after hours of riding
• Ideal for routine engine maintenance and performance restoration
• Suitable for recreational trail riding and competitive motocross

Specs At A Glance

Good To Know

Q: Is this a direct replacement for the original Yamaha piston? A: This kit is designed as a direct replacement for the OEM top end components in the specified Yamaha YZ250 models. Confirm serial number compatibility before ordering.

Q: What is the difference between Size B and Size C? A: The sizes indicate different piston clearances; use the size that matches the cylinder's measured bore. Standard Size B is for cylinders within 68mm specification.

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