I think you will need to take the carbs off and strip them down to clean out all the resinous stuff left in them from evaporated petrol. The jets will have to come out and all the drillings in the carburettors blown through with an airline. Better still would be an immersion in an ultrasonic cleaner.
I suspect if you do not do this you will be chasing a poor starting /poor running bike for the rest of the year. Just draining the carbs will leave the gum in the carbs and putting new petrol might dissolve some of it but there will be jet blocking globules that will drift in and out of play unless they are completely removed.
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