Namura .020 Over Bore Top End Rebuild Kit for Honda Z50R, CRF50F & XR50R 39.5mm

.020 Over Bore Top End Rebuild Kit for Honda Z50R, CRF50F & XR50R 39.5mm

This .020 over bore top end rebuild kit from Namura includes a 39.5mm piston, rings, wrist pin, circlips, and all necessary gaskets to rebuild the top end of Honda Z50R, CRF50F, and XR50R engines.

Overview

This .020 over bore top end rebuild kit from Namura provides all components for a complete top end rebuild on Honda Z50R, CRF50F, and XR50R engines. The .020 over bore piston ensures a tight fit after cylinder boring. This top end rebuild kit includes piston, rings, pin, circlips, and gaskets for a thorough overhaul.

Built For Performance

• Includes 39.5mm aluminum alloy piston for lightweight strength
• Chrome ring set for reduced wear and long life
• High-strength wrist pin and circlips for secure connection
• Complete gasket set for leak-free cylinder head seal
• Precision-machined components to tight tolerances
• Designed for use with .020 over cylinder bore

Fits These Machines

• for Honda Z50R
• for Honda CRF50F
• for Honda XR50R

On-The-Job Use

• Engine top-end rebuild and piston replacement
• Cylinder boring and oversize piston installation
• Restoring compression on mini bikes and pit bikes
• Performance restoration on Honda Z50R, CRF50F, XR50R
• Dirt bike engine overhaul and maintenance

Specs At A Glance

Good To Know

Q: Does this kit include the cylinder jug? A: No, this is a top end rebuild kit; the cylinder must be bored to the .020 over specification separately.

Q: Is this piston compatible with stock cylinder heads? A: Yes, the kit includes a piston designed for use with the stock cylinder head after proper boring.

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