I've got an STM Evo lightweight, diaphragm sprung, non slipper, clutch in my 916 which is fitted with the standard plates as supplied by STM with the clutch.
Recently when I stripped the clutch to readjust the height of my pack, after about 8k miles, I too have found the outer basket to be well worn. It will not be long before the file will have to come out the toolbox!
I thought STM were meant to be good quality items but I know have my doubts
Anyone any ideas on this one?
Cheers
Mike