Oil in the gas

[TimSr]

I really doubt it. Your engine burns small amounts of oil under normal operation, and upping the oil amount mostly just retards burn rate and give you the by products of incomplete burning. I guess it could give you more carbon than usual which could cause problems, but Id just run it rather than tear it down to find out. If you tear it down just to look youll need up buying new gaskets for a problem that might not exist. If you run it and the smoke goes away, and you dont have compression problems, youll know youre seats are okay.

[edog]

I second that.

[Wickedfinger]

I was thinking hotspots from the carbon. I know the exhaust valve seats can be pretty sensitive to it, especially in an aircooled motor. The valve hitting down on the redhot carbonized spots can cause it to deform the seat. I guess if he isn't getting alot of knocking, or post detonation when he hits the kill switch, its not an issue.