I hate to say it but I always put the throttle to the left on both bikes.. mainly because I am right handed and the better control to the brake I have the safer I feel (well, up to recently anyway)
I guess it might be a little different with the twistgrip type throttles - im going to try for a foot throttle as soon as I can and I have the parts required
"....Look, no pedals... *thud*..." The mating call of the motorized-biker.
"RetroEagle" - 32cc Two-Stroke, Piped. 35mph on #13 gear. Reversed stem with springer fork.