Should be safe with a 32:1 mix...4 oz. pre-mix to 1 gallon gasoline.
Drain out tank and carb bowl of all straight gas.
Mix fuel in a separate container and not in bike tank.
this is what you need to do. ^^^
undo the drain on the carb bowl if it has one, otherwise youll have to pop it off. your engine can run for minutes on just the fuel in the lines and carb, probably. thats running for minutes without oil.
i almost killed a 2 stroke once, i thought i mixed oil into the gas, but procrastinated and forgot. then going up a hill the poor thing sputters out. i was able to get new rings and save the piston, but that could have been alot worse.
it will never run the same once you run it with straight gas. (without a total tear down and rebuild).