Features Gravity cast aluminum alloy with 18% silicon to increase resistance to wear and decrease thermal distortion, thus providing a longer piston life Wrist pin is nitride-coated, providing a hardened, wear-resistant bearing surface Coated skirt ease break-in, decreasing wear and aiding in lubrication OE replacement with OE compression ratio Replacement rings are sold individually Wear-resistant piston rings Piston kit includes piston, rings, wrist pin and circlips Specs Product Name Piston Kit Style Cast Replica Piston Material Aluminum Alloy Skirt Coating Molybdenum Disulphite Piston Diameter 53.94 mm Compression Ratio Stock Cylinder Diameter 54.00 mm Displacement 125 cc Engine Type 2-Stroke Units Kit Riding Style Off-Road Fitments Position Notes 2000-2003 Honda CR125R - -