When I was in college, I crewed for a friend who was racing scooters. There were several classes, from 50cc stock scooters to 250cc highly modified. The series was run on go-kart tracks all over CA, and it really was a lot of fun. Mostly Vespas and Lambrettas, especially in the faster classes, as there's lots of speed parts available from Italy for those. We generally had a much better caliber of riders than in that video, although there was an occasional prat.