Hello all. I'm new here and new to building a motor on my bike. I live in So. California and am looking forward to having a motor on my bike. I've already run into a problem. I can't seem to get the clutch to disengage the sprocket from the motor. When I turn the sproket (its very hard to turn I can't do it by hand) I can hear stuff inside the motor turning. How am I going to install the chain without being able to easily spin the sproket? Thanks for your help.