I had the same problem on a buddies machine. I bent a couple pullers trying to get the clutch off, so I cut one of the pullers slightly below the threads and packed the crank with grease, and threaded the cut puller into the clutch. The hydraulic pressure popped it right off. You've got to make sure to get all the air out, otherwise the pressure won't build up enough. I could not get the clutch to budge using the standard method of greasing the threads and using an impact wrench.