ChrisL, guess you never looked at Suzuki twins from 60s and early 70`s. 125, 200, 250, 350 and 500 twins, all left hand kickers.
My bike, was cut up to make a racer, thank stuff they never started on the engine, as what ever they did, like shorten the swing arm, was a real back yard job. My RD ypvs, will leave it standing, it was fitted with a GSX 1100 ignition, still with advancer, guess why it won`t go, only ridden it for a few hundred metres, then stripped it. Going to import a ignition for it, don`t want points. Spent a wack on it so far.