I did have an old 10 hp briggs, flat head. After it warmed up you could see gas molecules when you removed the air filter. Engine would start missing and spark plug would carbon up.
The problem was intake valve seat recession causing the air in carb to run backwards causing a rich condition.
I had to remove the intake valve and grind off some of the valve stem. I had that happen a few times on the old briggs flat head engines.
So if the tractor is running OK, I wouldn't worry. If tractor is missing at an idle I would be checking the valve clearance and compression. Intake valve may be leaking compression back into the intake.
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