Re your clutch drag prob, it may not even be the hydraulic release mechanism, on my 2001 Sherco a lot of use caused the "ears" on the clutch plates to wear slots in the clutch drum "arms", this stops the plates from separating properly when the clutch is pulled in = drag even when hot. If the slots aren't too deep sometimes you can dress them out with a file, if they're too bad it's a new clutch drum/primary gear set. This prob affects lots of trials bikes ridden on the clutch all the time, hope this helps!