Namura Standard Bore Top End Rebuild Kit Size B for Honda CR85R & CR85RB 47.5mm

Standard Bore Top End Rebuild Kit Size B for Honda

This standard bore top end rebuild kit size B for Honda CR85R and CR85RB provides a 47.5mm piston and all necessary components to restore top-end performance in your dirt bike engine. The standard bore top end rebuild kit is built to Honda's original specifications for a direct, reliable replacement.

Overview

This standard bore top end rebuild kit size B is designed for the Honda CR85R and CR85RB, featuring a 47.5mm piston, rings, wrist pin, gaskets, and bearings. It is the ideal solution for riders needing a complete top-end refresh to regain lost power and reliability on the track or trail.

Built For Performance

• 47.5mm standard bore piston for direct OEM fitment
• Kit includes piston, rings, wrist pin, circlips, gaskets, and bearings
• High-strength cast aluminum piston for durability
• Precision-honed cylinder compatibility for optimal compression
• Size B specification ensures accurate sizing per Honda's service limits

Fits These Machines

• for Honda CR85R (all years)
• for Honda CR85RB (all years)

On-The-Job Use

• Used during top-end rebuilds on Honda CR85 motocross bikes
• Restores compression and power for competitive racing
• Ideal for track and trail riding maintenance
• Supports extended engine life with regular replacement

Specs At A Glance

Good To Know

Q: Can this kit be used on a Honda CR85 with a different bore size? A: No, this kit is specifically for 47.5mm standard bore engines; using it on other sizes may damage the engine.

Q: Do I need to replace the cylinder when installing this kit? A: Only if the cylinder is worn beyond service limits; otherwise, the standard bore piston can be installed directly.

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