Oil leaking into spark plug hole

ReX

TY 4 Stroke God
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When I installed a set of new plugs a couple of days ago I noticed the PTO side spark plug hole had a little oil in it.

Not much, just about the equivalent volume of a single drip that had run down into the spark plug hole.

It looks like it is oozing from the gasket between the valve cover and head.

Is this a common problem? Should I worry about it? Does it typically get worse?
 


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