New 4 disk lawn mower racing clutch for a 1.125 bore. This clutch features 4 cart style disks and 6 springs. All parts have been designed and machined here in house. All the steel parts have been made out of heat treated tool steel and zinc plated for appearance and corrosion resistance. Bearing surfaces have been surface ground to exact tolerances. Clutch has a non-replaceable 520 motorcycle chain sprocket. This clutch is still in the testing stages, we have several out and we are testing the engagement rpm and the weights so we can better inform the buyer of settings. We listed this so racers know what is available. This clutch was designed for high HP high RPM Kohler Command racing engines.