Namura .040 Over Bore Piston Kit for Honda CR85R, CR85RB Expert 2003-2007 48.5mm

Namura .040 Over Bore Piston Kit for Honda CR85R/CR85RB Expert

This Namura .040 Over Bore Piston Kit provides a 48.5mm bore for Honda CR85R and CR85RB Expert models from 2003 to 2007, delivering increased displacement and performance.

Overview

This .040 Over Bore Piston Kit is an excellent choice for rebuilding the top end of your Honda CR85R or CR85RB Expert. It offers a slight increase in bore size to refresh the cylinder and boost power. The kit includes everything needed for a direct installation, making it a convenient .040 Over Bore Piston Kit for your dirt bike.

Built For Performance

• Precision-machined 48.5mm bore for .040 overbore application
• High-strength aluminum alloy construction
• Includes high-quality piston rings and wrist pin
• Lightweight design reduces reciprocating mass
• Plated piston skirt for reduced friction

Fits These Machines

• for Honda CR85R (2003-2007)
• for Honda CR85RB Expert (2003-2007)

On-The-Job Use

• Restoring compression in a worn Honda CR85R or CR85RB Expert top end
• Replacing the piston during a complete engine rebuild
• Achieving consistent power output for motocross racing

Specs At A Glance

Good To Know

Q: Is this kit suitable for a standard bore cylinder? A: No, this .040 overbore kit requires a cylinder that has been bored to 48.5mm; do not install in an unmodified cylinder.

Q: Does the kit include a piston pin retention clip? A: Yes, the kit includes the necessary clips for secure installation.

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