Well, this falls out of the post-1965 range, but in the early 70's I made the mistake of buying a 1955 Triumph 500 vertical twin. Ran OK when it ran, but I could never get used to the right side shifter. It would inexplicably stop running or would not start at frequent intervals and inconvienent moments. Curse the Lucas zener diode, curse Brit bikes. I re-commenced buying Japanese bikes.