If you do mix it yourself don't forget that you are dealing with 2 different mix ratios.
1. Gasoline to air mixture.
2. Fuel mixture = gasoline +oil.
When you richen the fuel mixture......(more oil in the fuel), this leans out the gas to AIR mixture. The Oil displaces the gas.
Less oil in the FUEL mix, richens the fuel to air mix.
Lots of people confuse these. Having too much oil in the fuel mix CAN cause your bike to run hot and seize.