Polini Motori has designed and produced a clutch with a new adjusting system. Each shoe presents an adjusting screw with a graduated scale for a precise calibration of the springs pre-load. Springs pre-load adjustment: the clutch is supplied with a standard calibra- tion to be t it on the original engine. To vary the clutch timing operate on the screws: by screwing it you give more load to the spring and consequently an increase of the clutch bite; by unscrewing it you achieve the opposite effect.