One user's comment about that video says the Megola used a rotary and not a radial engine. I saw one at the Munich Museum of Transportation. He is incorrect. It used a 5 cylinder radial engine. Pics I took of it below.
Current: 08 Norge, 06 Suzuki Burgman, 06 Yamaha Morphous
Past: 3 Buell Lightnings, 02 BMW R1150RS
05 Ducati Multistrada, First gen Kawasaki Concours, Kawasaki Vulcan 1500 Classic, 02 Honda ST110, Aprilia Falco, Suzuki VX800, Yamaha Radian, Suzuki TS185, Yamaha RD400