Namura Standard Bore Size A Piston Kit for Honda many CRF250R & CRF250X 78mm

Namura Standard Bore Size A Piston Kit for Honda

This Namura standard bore size A piston kit for Honda CRF250R and CRF250X motorcycles is an aftermarket replacement designed to restore compression and performance in 250cc four-stroke engines. It offers a reliable alternative to OEM parts, with precision engineering for a direct fit in compatible Honda models.

Overview

Built for Honda CRF250R and CRF250X dirt bikes, the Namura standard bore size A piston kit provides a drop-in replacement for the original piston when rebuilding the top end. It helps restore lost power, improve throttle response, and extend engine life for off-road and motocross applications. This kit is crafted to meet factory specifications, ensuring dependable operation in demanding riding conditions.

Built For Performance

• Standard bore size A configuration for direct replacement without cylinder boring
• High-strength aluminum alloy construction for reduced weight and heat dissipation
• Precision-machined ring grooves and pin bore for consistent sealing
• Includes piston, rings, wrist pin, and circlips for a complete rebuild solution
• Engineered to match OEM compression ratio and clearance tolerances

Fits These Machines

• for Honda CRF250R
• for Honda CRF250X

On-The-Job Use

• Rebuilding top ends on Honda CRF250R motocross bikes after racing wear
• Restoring compression on CRF250X trail bikes for consistent off-road performance
• Replacing worn pistons during scheduled engine maintenance or after piston failure

Specs At A Glance

Good To Know

Q: Is this piston kit compatible with both CRF250R and CRF250X models? A: Yes, it is designed for both models, but always confirm your engine’s specific year and serial number to ensure correct bore size and pin height.

Q: Does the kit come with installation instructions? A: The kit includes the components but not detailed instructions; professional installation is recommended to achieve proper ring gap and clearance.

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