Mason bees and small wasps will often fill such a hole with a nest or partial nest anyway, I wouldn't think it requires a carburetor overhaul just because of that. Check the drain hole on your magneto cap area while I'm thinking about those bees, they rusted mine several times that way till I filled the hole with the filter off of a used cigarette.
Have you tried to open the load screw 1/4 of a turn and give it another run down the track? You may have the idle side set too rich compensating for a too lean setting on the load screw as well. Back in the days when I was leaving gas in the tank or carb for that matter, I got into the habit of opening the needles and returning them to their original position before start up just to save time doing that same thing once I tried to work it a little. Varnish forms on the sides of the needles and cracking them loose like that allows fresh gas in there to dissolve it away. Since I've left both the carb and tank dry when done with it anymore, I don't have to do even this much. Gasoline has always formed gum, varnish, and gone bad in a real stinky manner - it's not the ethanol doing it. Leave them dry and save yourself some hassles.