If you can get hooked up w/ a repair job, that's a great resource for parts for you as well as getting good mopeds back on the road. Most will probably run after a bit of work, I'd guess. I've heard good things about Tomos.
I say, go for it! If you have problems fixing them up, I'm sure Fred's repair tutorial will help. Or post in the forum, these guys seem to know EVERYTHING.
But you cary a freakin' repair shop when you ride. So I'd guess you can fix them right away. ;-)