Namura Standard Bore Piston Kit Size A for Honda CR85R & CR85RB 2003-2007 47.5mm

Namura Standard Bore Piston Kit Size A for Honda

This Namura standard bore piston kit size A is a direct replacement for Honda CR85R and CR85RB models from 2003-2007, featuring a 47.5mm bore for reliable engine rebuilds.

Overview

This Namura standard bore piston kit size A is a drop-in replacement for Honda CR85R and CR85RB two-stroke engines from 2003 to 2007. Designed with a 47.5mm bore and precision-machined from high-strength aluminum alloy, this standard bore piston kit restores compression and power after top-end wear. Riders rebuilding their Honda minis will find this kit an economical choice for getting back on the track.

Built For Performance

• High-silicon aluminum alloy casting reduces weight and improves heat dissipation
• Precision-machined skirt and ring grooves ensure consistent sealing
• Includes piston rings, wrist pin, and circlips for a complete top-end set
• Bridged intake design strengthens the piston crown under high RPM loads
• Plated finish reduces friction against cylinder walls

Fits These Machines

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

On-The-Job Use

• Motocross racing on outdoor tracks
• Off-road trail riding and hare scrambles
• Rebuilding top-end after piston wear or ring failure

Specs At A Glance

Good To Know

Q: Do I need to hone the cylinder before installing this kit? A: Yes, always deglaze or hone the cylinder to the correct crosshatch pattern and verify clearance per the manufacturer’s service manual for proper ring seating.

Q: Can I use this piston kit with a stock cylinder? A: Absolutely, this standard bore size A piston is designed to fit the stock 47.5mm cylinder bore without oversize machining.

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