There have been alot of questions about the APTC clutch used on many new ducati models latley. I had one sitting unused in my garage so I took a few pics to clear up some issues on its operation.
The "slipper" part of the clutch is all contained in the clutch hub.
(http://i87.photobucket.com/albums/k126/bmeath/th_Picture072.jpg)
In the rest position the 2 parts of the hub are separated by spring pressure allowing the clutch to slip.
(http://i87.photobucket.com/albums/k126/bmeath/th_Picture073.jpg)
The hilical cuts in the hub over come the spring pressure pull the 2 halfs together when power is applied. This is when the clutch is fully disengaged.
(http://i87.photobucket.com/albums/k126/bmeath/th_Picture075.jpg)
I do not know of any one that tunes the slip characteristics of this clutch but I think the main area to look at would be these 3 springs under the pressure plate
(http://i87.photobucket.com/albums/k126/bmeath/th_Picture074.jpg)
I hope this helps explain the clutch better.
nice - thanks for the photos and part point out. [thumbsup]