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take the spark plug out of the head. then put the spark plug wire back on the spark plug. ground the plug on the engine you can do this by putting the plug any where there is metal and lay it on it. then turn engine over and see if you have spark. if not then do the same thing with just the wire by putting a Philips screw driver in place of the plug, ground it turn over the engine see if there is a spark if their is the plug is bad. if not then the coil or flywheel is bad more than likely it is the coil

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Q: How do you tell if a lawn mower spark plug is bad?
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