I actually have one in the shed I used to use to go to work in Cali with, actually put a 2 stroke motor kit on it it is a blast, you can still use it as a regular bike also.
I got talking to this guy at the local cruise spot a couple of weeks ago with one of those kits on his bike, it was pretty cool... He says that he can cruise around all day on $1.75 of gas and he can easily get up to 40 MPH....