SecretMoblin
Member
It's a little earlier than that now. You can hold gas as the 2 appears.
(I used to do it differently in older Mario Karts - hold the gas, then tap the gas alot when the timer reaches Go.)
Someone in here earlier - sorry that I don't remember your username - said that it's easier to watch Lakitu's hand. He'll raise it right after the '2' appears, and you can time your button press with that.
Either way, it's extremely easy to get the timing right when you know it. There's a pretty big window.