2003-2007 Honda CR85 Dirt Bike Engine Piston Kit [Bore Size (mm): 47.46] Bore Size (mm): 47.46 Compression 8.4:1 - Nikasil Cylinder Namura Piston Kits Include Piston, Piston Rings, Pin and Circlip High Silicone Content for Additional Strength Compatibility: 2003-2007 Honda CR85