Long time lurker, finally got myself a moped. It's a 1970 Motobecane 40V basketcase... with a badly seized engine. The previous owner attempted to un-seize it, but it's basically dead (water got into the case, got rust all over the crank too.
I found a 50V engine on the 'bay ( http://www.ebay.ca/itm/280878958280 ), but would it work on mine?
You can see a pic of mine from the seller's ad on CL here: http://abbotsford.en.craigslist.ca/mcy/3043681244.html