SLIPPER CLUTCHES EXPLAINED
When you accelerate the engine turns the rear wheel, close the throttle and the reverse happens as the rear wheel’s momentum attempts to turn over the engine, this can lead to engine damage due to overrevving as well as upsetting the rear suspension and compromising rear grip. Inside a slipper clutch the centre has been redesigned with five or six little ramps so that it rises when this happens. Once it has risen about 1mm, it then pokes the pressure plate off the top of the clutch, which has the same effect as if you had lightly pulled in the clutch lever. This eliminates the effect of the rear wheel on the engine, reducing over-revving and settling down the rear suspension as you tip into the corner. As soon as the throttle is opened again, the clutch smoothly re-engages.