How about Erik Estrada (spelling?) I heard he came off a Kawasaki while filming an episode of ChiPs, bike was KZ900? Pretty sure it put him in hospital. I loved that show when I was a kid.
The GT250 was the same power as the RD. The bigger GT’s didn’t deliver on power. The Kawasaki S1 had a touch more power but was shite. Other than them I cannot think what else it could be.