Thanks for the replies. DC's advice is spot on about measuring the top tube. Didn't know the specs of a small Yo Eddy, so last week I took a measuring tape to my M2 and the Yo. Just about an exact match which is very cool. But the M2 has a 112mm head tube vs. 90mm on the Yo (again DC is right on the money). Also, the Yo has 1/8" shorter chainstays so I am anticipating a better climber. Then again, the engine might be the problem not the frame.
Anyway, based on tt similarities....I made a deal. The grello/blue fade Yo as seen on CL is now in my garage (I'll post some pics soon). I've already dissembled most of it to get a better look inside and it looks rust-free except for some surface corrosion. Cleaned up those spots nicely with navel jelly and I'm sorting through the parts to figure out how I want to rebuild it and which parts to put up on ebay.
I'd like to swap out the QR seat collar/clamp for a clamp with bolt. I know the internal diameter of the seat tube is 29.4mm, but what about the outside? And also, which brands make seat collars that fit the Yo Eddy? Hope? Salsa?
Thanks