I have a 1980 50V "Mobylette" Yes, the Gurtner carburetors are not great, but neither are the Bing carburetors on Puch engines. I have a 1979 Sears Free Spirit with the Puch E50 engine, and I cannot get the Bing carb to stop leaking around the float bowl. One of the biggest issues with Motobecanes is electrical issues. I also have a '70s model Solex 3800, which I believe was made by Motobecane, though I'm not positive. If it is not rusted out, bent, or seriously damaged, I would buy it if you have a legal way to transfer ownership. In my state a simple bill of sale is all it takes. Mopeds do not have titles in my state. If you need a title, and the seller doesn't have one, it's probably not worth messing with. Vintage mopeds are skyrocketing in value. I paid $1000 for my Sears Free Spirit a couple years ago. It was in great condition, but I have already spent almost $500 more making it perfect. I could likely get every penny back if I decided to sell it. These things are no longer a dime a dozen.