Assuming you don't want to use the pulley these work great. Just tighten up the bolt and the pulley will crack in half. Doesn't risk damaging the motor with heat or any pulling.
You can get them at most hardware stores like sears. Home Depot might even have them. Look under nut splitters. Best of all they are CHEAP.
http://www.harborfreight.com/cpi/cta...emnumber=40929
