My favorite part of a jet bike is the startup noise. Here's Jay's. Starts at :56. This would be my orgasmatron.
A number of years ago when I was still working (flying LE helicopters), meet a person at Santa Monica airport who said he had an interesting motorcycle in his hangar that my partner and I might like to see. Went over to the hangar, and he had the jet bike, same as Jay Leno, but his was painted like an F-86 jet fighter. One pretty bike, and he started it for us, felt like I was starting my helicopter, just fantastic. Of course he had his Robinson helicopter also in the hangar, and an Enzo at home. Talk about money.
The engine in the bike is from surplus OH-58 Army helicopters.