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

Namura Standard Bore Size C Top End Repair Kit for Yamaha YZ250 (1999-2001, 66.4mm)

This top end repair kit replaces the piston, rings, wrist pin, and circlips for Yamaha YZ250 models from 1999 to 2001 with a 66.4mm bore, restoring compression and engine performance.

Overview

The Namura Standard Bore Size C Top End Repair Kit is a direct replacement for the original piston assembly in Yamaha YZ250 two-stroke engines. It includes all necessary components to refresh the top end, ensuring reliable power delivery and extended engine life. This kit is designed for riders who need a dependable rebuild solution for their YZ250.

Built For Performance

• Precision-machined piston from high‑silicon aluminum alloy for durability
• Includes rings, wrist pin, and circlips for a complete top‑end overhaul
• Standard bore size 66.4mm matches OEM specifications
• Designed for Yamaha YZ250 1999‑2001 models
• Namura aftermarket quality at a competitive price point

Fits These Machines

• for Yamaha YZ250 (1999‑2001)

On-The-Job Use

• Motocross and off‑road racing applications
• Trail riding and enduro events
• Top‑end rebuilds during engine maintenance intervals

Specs At A Glance

Good To Know

Q: Does this kit include gaskets? A: This top end repair kit includes the piston, rings, wrist pin, and circlips; cylinder base and head gaskets are typically sold separately.

Q: Are there different bore size options? A: This is the standard 66.4mm bore size; oversize options may be available if you are boring the cylinder.

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