Original Block has cast-in liner in the cylinder Re-sleeve worn or seized cylinders with sleeves manufactured by LA Sleeve Co. An economical solution available for riders, racers and engine builders everywhere. Centrifugal castings used in these sleeves are made from a carbon-chrome-molybdenum alloy of 200 Brinell hardness, ensuring ease of installation, trouble-free boring and a dependable, long-lasting engine This Item Fits the Following Applications: 2001 Suzuki RM250