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what is the mix ratio to gas to oil on a 2 stroke dirt bike?

 
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If you cant find out. Try out his method which we used when we used to modify engines. Empty tank put about a half pint of premix at the highest ratio say 16:1 run it watch the smoke. It should be white. Try with lower ratio say 20:1. Keep watching the smoke until you find the ratio where it disappears. Use the ratio where it has almost but not quite disappeared. If you are going to thrash the motor a slightly higher ratio is needed. also if you change from a separate oil tank to premix then the jets need to be changed as the oil will replace some of the fuel as the fuel/air mix will be too lean.

 
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for some time now the industry standard has been 32:1. You need to decide what brand and type oil you are going to be using and read the label or call the manufacturer of that oil. Use a high quality oil of course and use an oil that is also easily available. You do not want to run out of gas and you use belray and all your buddies use yamalube or ??? In the early days the label on bikes said 20:1 and so on over time. The changes in oils as well as changes in engines(air cooled/water cooled) is why an old '78 said 20:1. Sorry for the long answer, a specific model would have gotten a shorter answer.

 
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the simple, and logical answer is >refer to the manufacturer, if its a honda call up honda.