You can also run into a problem on material composition. Walbro carbs usually contain some rubber or neoprene components with will decompose with alcohol. If you have any silicon parts in the engine, gasoline will attack and destroy them. The needle valves for gasoline must have a finer taper and adjustment than those used for alcohol fuel as the flow rate will be about twice as high when using alcohol instead of gasoline. If you try to use the same needle valves with gasoline as you used with alcohol you will have a hard time getting a proper fuel mixture adjustment.
I have had three Walbro carbs malfunction after using gasoline with a high alcohol content (you can not get pure gasoline in Florida any longer) so I switched to using Colman Camp Stove fuel instead. No carb problems since and power and performance seems to be the same as with gasoline although the cost per gallon is higher.