STM clutch conversion from the original wet clutch to the STM dry clutch. 
 
 Difference to the EVO SBK: 
 Outer basket with 40 teeth and extra "cooling ribs" (see picture Z40 Basket) 
 
 Advantages of an STM dry clutch: 
 - less power loss via the dry clutch 
 - Contributes significantly to preventing the engine from overrunning when downshifting 
 - prevents a jumping rear wheel 
 - reduces the trigger pulse of a highsider 
 - Controlled sliding of the rear wheel possible 
 - easier control of the closing phase of the clutch in curves (to avoid nodding). 
 - allows a better feeling when releasing the clutch lever (start) thanks to the diaphragm spring. (This prevents the pressure plate from wobbling) 
 - Significant weight savings (reduction of the rotating masses) ~ 0.7-0.8 kg 
 - Patented ball ramps to control the anti-hopping function