White Smoke From Lawn Mower. Because there isn't enough air, combustion is incomplete, and the unburnt fuel in the combustion chamber turns to smoke. So what causes white smoke from a lawn mower?
This seems to be because some part of the engine has been flooded by gasoline and/or oil (because, I guess. Every lawn mower needs to oiling to prevent overheating while in use. Lots of my customers add oil, without ever checking the.
This is why you no longer see chokes on any small engine.
Every lawnmower owner experiences an odd colored smoke coming out of their mower's exhaust at some point.
I was putting new oil in it and then started it up. B&S engines are not very precision engines and oil will leak into the cylinders from any number of places. Oil also lubricates your mower to make it work efficiently.