A slightly high float level can cause fuel to spill over into the venturi and cause an over-rich idle mixture when hot, and also create a flooding condition that requires extra cranking time to clear the flood if the engine is restarted within a few minutes of a hot shutdown. It's more common on a downdraft, but I've seen the same kind of symptoms on tractors with updraft carbs.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!