AJ is a paraplegic. He doesn't do much pedaling, and getting on a motorcycle is a bit hard for him. So he did what any sane person would do, and made a bike from scratch. Of course I'm being sarcastic as not just any one can make a bike as practical or as lovely as AJ.
As you can see in the video the bike stands upright via two wheels that are controlled by linear actuators. Yes he made this system himself.
The drive train of the bike uses a high speed Turnigy HXT motor made for model airplanes and a Shumaker reduction drive to gear the very high speed motor down to usable speeds.
Check out his walk around video which has some shots of the bike in action down in Aussie land.
Read through the 100 page build log on the Endless-sphere forum.