I don’t see how you start the engine would make any difference to the carb. Any time I tried to put a bigger carb on something it just made more problems than it was worth, especially on a small sprint track.
A bigger carb may get you a little more top end horsepower it will come at the expense of throttle response. The smaller bore creates a higher velocity through the carb. This higher velocity of air aloows the jets and such to be much more responsive at partial throttle.