Namura .020 Over Bore Top End Repair Kit for Honda CRF230F CRF230L CRF230M 66mm

Top End Repair Kit for Honda

This Top End Repair Kit is a .020 over bore assembly designed to restore compression and power in Honda CRF230F, CRF230L, and CRF230M models. It includes a 66mm piston, rings, gaskets, and necessary hardware for a complete top-end rebuild. The Top End Repair Kit provides all components needed to refresh the cylinder head and piston assembly for reliable performance.

Overview

This Top End Repair Kit for Honda offers a .020 over bore solution with a 66mm piston, making it ideal for rebuilding CRF230 engines that require oversize components. It includes a piston, rings, gaskets, and pins to facilitate a straightforward top-end overhaul. The kit is designed for Honda CRF230F, CRF230L, and CRF230M models, ensuring a proper fit and restored engine function.

Built For Performance

• Includes .020 over bore piston with 66mm diameter for increased displacement
• High-strength aluminum alloy piston for durability
• Precision-machined rings provide excellent compression sealing
• Complete gasket set included for cylinder head and base
• All necessary hardware (piston pin, clips) included for installation
• Designed to match OEM tolerances for reliable performance

Fits These Machines

• for Honda CRF230F
• for Honda CRF230L
• for Honda CRF230M

On-The-Job Use

• Commonly used for top-end rebuilds on Honda CRF230 trail bikes
• Ideal for restoring lost compression and power in high-mileage engines
• Suitable for both recreational riding and competition use
• Applied in workshops and home garages for engine restoration

Specs At A Glance

Good To Know

Q: Is this kit suitable for a standard bore CRF230 engine? A: No, this kit is for .020 over bore; it requires the cylinder to be bored to 66mm. Confirm your current cylinder bore size before ordering.

Q: Does the kit include a new cylinder or only the piston and gaskets? A: The kit includes the piston, rings, gaskets, and hardware; the cylinder must be reused after boring or replaced separately.

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