So I have an early 80s Grycner trike and ive been neglecting it for few months now. I got it without an engine or drivetrain. I was thinking of turning it back into a 2 wheeler and I was wondering if anyone had any ideas on what engine I should put in it and what sprocket I guess? For the back. I'm new to mopeds so I don't know what's good and what to stay away from or what's reliable or cheap. Any help will be greatly appreciated! Thanks!