My father built a T20 250 road racer that was ridden by Ray Curtis and later, Billy Macdonald.
All I know of it was that dad machined his own cylinder heads but I was too young to know what else he did to it.
On it's first outing at Bathurst, Ray had a big lead in the Senior, 500cc, but couldn't stop it at the end of Conrod.
The Suzuki factory were at that meeting with their own bikes and wanted to buy dad's bike to take back to Japan, anyone who knew my old man would know that he was pretty strong willed, but he wouldn't part with it.
Billy won the Production race at Bathurst one year on Dad's Cobra, they were a bloody good thing.
I've got a T20 in the shed that I'm thinking of Twingling and turning it into a pre 70 Dirt Tracker.
I've got a photo somewhere of the 250 in the Pits at Bathurst with Billy & Dad, I'll post it if I find it.
I'd love to get my hands on the bike.