Since it seams that some of the guys that have replied to this thread haven't seen Kenny Roberts at the Indy Mile, I've just found that someone did what I wasn't able to do.
The footage from "Take it to the Limit", which shows Kenny on the TZ 750 is up on You Tube. It's only a few minutes long, but you can get the idea of what it took to ride that beast. He was riding the hay bales
Who ever put it up a big Thank You is in order