Duplicate please delete

Offhand, this is the first possibility that occurs to me: float valve or other fuel control fails in carb, fuel flows into crankcase, crankcase oil level rises, misting out the breather lines increases, breather mist fouls air filters. (Note to amateur theorists: don't embarrass yourselves by explaining that there's no pathway to the crankcase for fuel; too many of us have seen it too often).
 
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