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Originally Posted by BusyWeb
Is this a normal ?
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Well it's not AB-normal......for someone who does a good bit of hard riding.
It gets there because of "positive crankcase ventilation", where the oil fumes vent to the air box instead of to the outside air. They are supposed to be pulled into the intake and burned but under some conditions the fumes condense inside the air box instead.
Nothing to worry about, for now at least. Keep an eye on it. Wouldn't hurt to remove the air cleaner and wipe out the inside of the air box with a rag.