when it's flooded, the plugs will wet before they ignite, but if it,s just one side and she gets enough air, the other side could pump the other side untill it clears up, but the excess fuel will go out the exhaust. baisically, if you flood it, there will be unburnt fuel in the pipes, but should clear out after a min. i would check or replace the plugs when it's cleared up, replace the float needles, or adjust.
so i'm guessin that this is 2 things that happened at once, so make sure there is a good 1/8" slack at the thumb side, and sync the carbs. make sure there is no tension on the cables when you drop the idle screws all the way down, then bring the idle up 2 turns and start from there adjusting both sides together. if it still jumps really high, then you have an air leak somewhere and the flooding just added fuel to the extra air.