Original cylinder bore is alloy-chrome plated, nikasil, or electrofused; cylinder must be bored to accept new sleeveRe-sleeve worn or seized cylinders with sleeves manufactured by LA Sleeve CoAn economical solution available for riders, racers and engine builders everywhereCentrifugal castings used in these sleeves are made from a carbon-chromemolybdenum alloy of 200 Brinell hardness, ensuring ease of installation, trouble free boring and a dependable, long-lasting engineThis item fits the following models: 1993 Suzuki RM125