I recently installed a brand new ADA head on my ported 64X. After riding it during break in I noticed fuel/oil puddling around the spark plugs. No bad symtoms. Ski actually ran great. I removed the head and double checked all o rings and everything looked good. I am using NBK B8ES spark plugs. Appears like it is moving up the threads of the plug. Any idea on what else could be causing that or how to stop it?