its called amsoil saber and it seems to do the job just fine, although it is a tad pricey.
Pricey?! That stuff is 100:1 mix, 80:1 on a hot and heavy day. How can that be expensive? It is some of the best oil around from word of mouth.
Look into Red Line's two stroke oil as well, apparently it has been extensively proven to allow engines to hit higher rpm's then with any other racing oil tested.