By the way Transio, that one case I saw that wasn't easily cured by just draining the oil out was an extreme case where the guy didn't overfill by 20% or whatever - he doubled up and filled up the crankcase. It was a big single and the piston had stopped near TDC as they are wont to do. When he hit the starter and spun that big flywheel the crankcase was pressurized and you can imagine what happened... You didn't overfill it that much though so you should be OK - just drain the excess. As you were!