Small Engines (Lawn Mowers, etc.): B & S POWER BUILT 12 HP MOWER ENGINE., piston rings, valve guides

Question
Why would gasoline be sucked or drain into the engine & mix with the oil?
There does not appear to be a problem with the float needle sticking & the float seems to be OK.

Answer
Hi Ron,

Does it happen when running or sitting?
As long as the float's needle valve is closing, then the only other thing I can thing of is worn piston rings or leaking valve guides but that would show other signs also.
Hmm...Check the PCV valve if present.

Let me know what you find.
Michael