I can't get the clutch to disengage. I just installed a GRUBBEE 80cc Skyfire motor kit on my bike and during the whole installation I couldn't turn my back wheel b/c the clutch will not release. I just thought that's how these motors worked, but after reading through some of the posts, it seems like the clutch should be disengage while you are installing the motor. Is this how its supposed to be? I think that the metal ball may be stuck...any ideas on how to get it unstuck? Any help or suggestions would be greatly appreciated.