Originally Posted by shortys513
Thanks for the input guys! Large rear sprocket, jack shaft, #41 chain. They're on the list.
if you're using a jack shaft it's generally on a multi-speed mountain bike, so you won't need the large rear sprocket, because you'll be using the bikes gearing options. also i know i put this in my initial response but i must have deleted it by accident.
Classic Instructions for Building and Repairing Motorized Bicycle Engine Kits - Motorized Bicycle: Engine Kit Forum
lots of good reads for first timers in that thread.