Anonymous
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Replace the spark plug with a new one, correct size and heat range for your mower.
Have a look at the magneto to see if it is loose, and no damage to the spark plug wire and boot.
renpen
Without knowing what mower you are talking about it is hard to say what the problem is. The safety switches could be the problem. The first thing to do is to disconnect the small black wire from the ignition coil and see if you have spark.