Did valve adjustment on my 99 Honda 450es and now oil seeps from the valve cover. Took it appart a couple more times and all looks good. There is come black paint missing from the metal gasket, but doen't look like that would cause a problem. Anyone have this problem before. There is an o ring in there but I don't see how that would allow the cover to leak.

Thanks

 

The metal gasket originally had a wrinkle /groove around it .. After a few uses it will leak ..