Are you guys in the USA familiar with the english austin mini?
My old one was heavily modified, but had 125mph out of it (probably more like 115 or so in real terms), the sudden feeling i got of how unprotected i was in such a small car with a fiberglass front made me back of pretty quickly after though!
As for on bikes, had an indicated 98 from my old kawasaki AR125 when i was a kid, felt fine, but i was 17 and fearless.
145 on the back of my friends FZ750 didnt feel so great though.
My cb750 isnt on the road yet, whether it ever see's 100mph or not is debatable, the bit in mad max where goose's rear wheel locks up at speed scares me