Namura .020 Over Bore Top End Repair Kit for Yamaha YZ250 fits 2002-2024 66.9mm

Namura .020 Over Bore Top End Repair Kit for Yamaha YZ250

This aftermarket top end repair kit by Namura provides all necessary components to rebuild the cylinder head of a Yamaha YZ250 two-stroke engine, featuring a .020 over bore at 66.9mm to restore compression and power.

Overview

The Namura .020 Over Bore Top End Repair Kit is designed for the Yamaha YZ250, offering a complete set of piston, rings, wrist pin, and bearings for a precise top end rebuild. This kit allows riders to refresh their engine with a .020 oversize bore, improving performance and extending engine life. Designed for Yamaha YZ250 models from 2002 to 2024, it provides a cost-effective solution for maintaining peak engine condition.

Built For Performance

• Includes high-strength piston with .020 over bore for increased displacement
• Precision-machined from durable aluminum alloy for reliable operation
• Complete set includes piston rings, wrist pin, and circlips for hassle-free installation
• Designed to meet OEM specifications for consistent compression and power output

Fits These Machines

• for Yamaha YZ250 2002-2024

On-The-Job Use

• Commonly used for motocross and off-road racing where top end rebuilds are routine
• Useful for restoring performance on well-used YZ250 engines
• Often employed during seasonal engine overhauls to maintain reliability

Specs At A Glance

Good To Know

Q: Does this kit include a cylinder? A: No, this is a top end repair kit containing piston and related components; the cylinder is reused after boring to the .020 oversize.

Q: Is this kit compatible with stock cylinder? A: Yes, it is designed for a cylinder that has been bored .020 over to match the 66.9mm piston.

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