Morning Chuck.
Imagine coming to a stop sign or junction and you're shifting down through the gears to come to a stop. At the change from 4th to 3rd or from 3rd to 2nd, the engine just cuts out. Battery light comes on and rear wheel locks up. Now it's possible that the rear wheel is not completely locking, that in fact what I'm feeling is the engine braking so hard that it "drags" the rear wheel.
Now I know that a big twin with shaft drive can engine brake really hard but to actually lock up the rear?
Thanks again for all your help people!