I stand corrected for I feel this is with a right hand throttle & left hand spark for the gearchange lever looks as if it is on the left. Ours was the opposite, so possibly the older bikes were as strange as ours or it was modifed.
Mind you so many were aimed at sidecars, but many were used as solo bikes by us civies. The fun thing was when someone jumped on the bike, threw the sidecar gear lever to the front (thinking it was lst) only to have the bike lurch to the rear for farthest forward was REVERSE on the sidecar bikes (one position back was lst) that were being riden sole. Mind you some had the reverse in the farthest back position, so one often was mixed up when they rode a bike they did not know all the kinks it would have. LOL LOL