There are several "mod" or performance companies out there that will take you dollar, to satisfy that need for a little more speed.
If your only looking for the hole shot, you may think about changing your impeller with one of less pitch. This will bust you out of the hole but in top end speed, you'll lose a little.
In the world of mods, you have to give in one way to get in the other. Unless you go total mod, at which point, you make your engines life expectancy to be quite a bit shorter. If you like, follow this hyper link to RIVA. They are one of the best known on the net. But for impellers, do a google search on Solas.....http://www.rivayamaha.com/instructions.asp