View Full Version : oil on the spark plug

05-19-2009, 11:45 PM
Got a free 50 inch mower Whit a 20 hp koler motor. when it runs you see some white smoke coming out of the exhaust. I took out the spark plugs one plug had some oil on it not good, So I'm thinking i just need to replace the piston rings on one side. Is that a big job and is it worth it. The deck is in good shape so is the frame and body. What do i do

05-20-2009, 12:20 AM
White smoke out of the exhaust sounds like water in the gas or a blown head gasket. If you have oil on the plug then you are burning oil, and the oil is getting past the rings.