It's true. I haven't gotten it running very good yet, due to some throttle problems, but when I do I'll post here to let you know. You can mount a dellorto performance carb on a motobecane, as long as you have the right adapter. You can get adapters from the Moped Warehouse.
Unfortunately, performance parts natively designed for the Motobecane are rare. It's not as easy to mod out as an Italian bike.