STM Street Wet Slipper Clutch KTM 990 Adventure / Super Duke

A slipper clutch helps prevent rear wheel hopping or vibrations when rapidly downshifting. Primary spring makes pressure on the disc pack throught the pressure plate; replaces the helicoidal springs. Secondary spring puts pressure on the drum, regulates the opening of the slipper clutch and regulates the engine brake.  The primary and secondary springs are pre-loaded in order to generate an initial elastic strength of contrast. When you operate clutch lever, the primary spring is compressed. The spring releases elastic strength in proportion to the lever movement. The engine brake makes the drum rotate and shift outwards, causing the discs to disengage.