Registered Forum User
Big Twin
Posts: 1,773
Join Date: May 2004
Mood: Proud to own a Ducati :0)
You've got a 749S, so that's Showa forks. It's unusual to have problems with fork seals on those. Ohlins seem very prone to this sort of thing, and not just on Dukes either.
I would guess you've got some grit or a stone up there on the seal and it's worn through, or as Ace says too many wheelies.