Well,
I told the fellow I would put an engine in for him. He's a really nice fellow and his son bought this thing to ride back and forth to his lady friend from college and who am I to stand between a man and his stuff. He found one for 500. and it is near me so I had him bring the bike back to me and I will swap them out for him. I hope I haven't bitten off more than I could chew. I have replaced bike motors before, but never one with a drive shaft. If it is like a car, then I'm in like Flint, otherwise, I may be a while.
Thanks for the advice, if there is anything I should know about changing out this powerplant, feel free to overwhelm me with data. I searched for motor replacement and did not find anything. I'm assuming that is because they never fail. I hope it's not because they are such a pain in the ass that it's impossible for a shade tree mech. to do.