Amsoil Saber Professional Synthetic 2 stroke oil.
This is the only oil we use and recommend.
We use this in all of our stock and modified engines at 8 ounces per gallon.
One bottle makes 1 gallon of mixed gas.
Testing shows about 100 RPM more with this oil versus Honda HP2 at 10 ounces per gallon.
Dyno testing done by Mike Ross of Suicidal engines in Michigan.