You probably already saw the 24v motor used in the ForkenCycle:
http://ecomodder.com/forum/showthrea...sion-1683.html
Agree with rmay: the lifting capability isn't really the thing to look at. You could get a better idea by seeing the physical size of the motor. Heavy and overbuilt for the job is what you'll get in a forklift motor that can power a motorcycle to 55 mph.