What is a jet bike?
It's refference to Chrono Trigger probably. When you cross the time into far future, you take part of the wild race over destroyed city, with blue and yellow bike, that is named "jet bike". Also JOHNNY gives you before the race starts the "jetbikekey" item.
Google keywords: "chrono trigger jet bike", or "chrono trigger JOHNNY"
and screen proof: http://i1.ytimg.com/vi/5UQMkNIrQag/hqdefault.jpg