i just went and looked at that auction again...from what i can tell, that bike needs the following:
a spark plug. a bosch W8AC works fine.
a coil. i believe there are two on ebay right now. i dont know if they have the wire on them or not.
a carburetor. this may get tricky, as there are a few auctions online now for the proper carb bodies, but no guts. i'd post a 'wanted to buy' post in the classifieds on here. someone is bound to have it. Dan Adams in Maine has a crapload of moby stuff. i think the AR2.12 is the one you need for that model...
a bearing for the large pulley..again, ask around.
as far as the rod bearing goes, i dont know off hand how bad off that is..you should be able to check tolerances and all that with the manuals that were posted earlier.
all the cables are more than likely going to need to be replaced as well. you can cut regular bicycle cables to fit and work, but they stretch alot more compared to the stock thicker ones. you'll need a throttle cable definitely. it'd be easiest to buy one made for this.
after you have all that...you'll have to run through the wiring and make sure all that is in order as well, most importantly making sure there is spark at the spark plug first (just so you can at least see if it runs). i dont know how bad (or if) the wiring has been messed up on it or not. it looks like it could just be missing the headlight but i cant tell if the little wiring block is there or not.
sorry this is so wordy, but i hope it helps. motobecanes are great when they run, but they're a real pain when they dont.