LogFAQs > #877760956

Pull the spark plug back out and check the tip. Is it oily? Have you tilted the mower on its side recently? Gas or oil may have coated the combustion chamber, leading to a flood condition. Try a couple sprays of carb cleaner through the spark plug hole to flush it out.

If that doesn't work, try cleaning the carburetor. Gas is dirty, and the carb has very small holes that may be clogged. Take it apart, blast it with carb cleaner, then install new gaskets.