And how about a dirt bike that runs on air? Yamaha wouldn't donate a whole dirt bike for free to the cause if these guys didn't think it couldn't be done. They are serious and it looks like they already have a bike put together. I'm waiting for a video showing its performance. Here the guys are talking about it and showing it off. Seeing how you can make a super light motorcycle pretty easy these days I'm sure it would be able to go pretty far in this configuration.
Air powered dirt bike video here.