This video from Sears PartsDirect shows how to troubleshoot when your walk-behind lawn mower won’t start due to spark plug and ignition problems. If your mower isn’t starting, there are a few things you’ll want to check. You can use a spark plug tester to make sure your spark plug isn’t worn out. See how to use a multimeter to see if the stop wire is shorting to the engine. Then, you’ll want to check the air gap between the ignition coil and the flywheel. Lastly, you’ll want to check your flywhe

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