They are designed to partially disengage or "slip" when the rear wheel tries to drive the engine faster than it would run under its own power. The engine braking forces in conventional clutches will normally be transmitted back along the drive causing the rear wheel to hop, chatter or lose traction. This is especially noted on larger displacement four-stroke engines, which have greater engine braking than their two-stroke or smaller displacement counterparts. Slipper clutches eliminate this extra loading on the rear suspension giving riders a more predictable ride and minimize the risk of over-reving the engine during downshifts. Slipper clutches can also prevent a catastrophic rear wheel lockup in case of engine seizure or transmission failure. Generally, the amount of force needed to disengage the clutch is adjustable to suit the application.
The BMW clutch is probably not as good as some aftermarket ones infact id say its crude and the one In my duc was awesome but than again it was 1k.
I would not ride the BMW one thinking it will save your bacon, at the mo my feedback from using it, it will limit the lock up however it won't prevent it, and you'll get better feedback by blipping the throttle as suggested .
