[Stealth]

welcome to the world of the dry slipper clutch.

I had had four different slipper clutches (Bucci, Fast by Feracci, DP and JHP) on two different bikes (996 and 998) and they all do it.

Getting the stack height right is critical to lessen the likelihood of this happening.I seem to recall the clearance at the end of the stack should be 4mm - 4.5mm but there will be experts on this site who will give you chapter and verse.

Bleeding the clutch line does make a difference too.

In short, the first step is to set the clutch right at the beginning so this means getting the stack height right (as described above - don't rely on the plates you have as giving you the right stack height is lesson one).

You could also consider putting in more than one concave steel plate to create more tension in the clutch which lessens the symptom you describe.

slipper clutch plates do wear faster than conventional clutch plates as they get at least a double dose of partial friction activity (i.e. coming apart and together). So a fact of life of a slipper clutch is to check your tolerances every 1000 miles or so.

This constant attention can be a real pain and I am sure there will be those who say that they had slipper clutches that never had this problem. However, I have done over 50 000 miles with Ducati slipper clutches of different sorts and they all do it. The STM design may be better but I have no experience of it.

My initial advice if JHP fitted it is to go back to JHP. Rick is excellent at setting the plate height and will show you what to be done for the future.

If I am honest with myself, the slipper clutch for road use is bit of personal folly given that I only do a small number of track days a year. I have benefited from its use on fast Alpine tours where you are hammering between hairpins but this is hardly everyday!

I am sure I will get to the point that a lightweight clutch will be less of a pain and more of a gain than the slipper. Just my personal view though!