See: O.S. Engines

O.S. Engines have introduced the new 4-shoe clutch system for 1/8 Nitro Buggy. Designed for O.S. engines, it provides smooth power delivery, is easy to tune, and lasts a very long time. The 4-shoe clutch system comes as set with three different sets of springs marked for easy identification, two set of different aluminium clutch shoes also marked to differentiate them easily, shim, washers, bearings, flywheel, flywheel nut and a 13T clutch bell. The 4-shoe clutch system will be available in October.