Originally Posted by
Shimagnolo
IIRC, it was ~1975 that the DOT mandated all motorcycles standardize on shifter on left, and brake on the right.
Back in my 20's I knew a guy with one of those old HD's that had a foot-operated clutch, and a hand shifter mounted on the frame between his legs (aka "suicide clutch"). It was really amusing watching him shift.
I had an old Ducati with the rear brake and shift reversed, and an Indian that had right hand shift, left hand throttle, right hand spark advance, and a non suicide foot clutch. There was a learning curve but it wasn't that bad.