Both electrodes can wear away over time, extending the gap between them through which the spark jumps — which is ideally very tightly controlled. The plugs can also accumulate carbon deposits (a ...

Follow these steps: Check the gap: Use a spark plug gap gauge to ensure that the gap between the electrodes matches the manufacturer’s specifications. If needed, adjust the gap by gently bending ...

or socket ratchet A spark plug gap gauge or gap tool Your mower might have come with a spark plug wrench, usually a galvanized steel tube that's hex-shaped at one end and is used to turn spark plugs.