I will add to Allan's correct answer. The typical issue is oil fouling today. When leaded fuel was used it could be lead deposits, or oil fouling. The oil "cokes" carbonizes, leaving a conductive path on the insulator. When the gap is made large by pulling off the lead a ways, The coil then increases its voltage to jump that gap as well as the plug gap (and fouling) thus the plug fires the fuel/air mix. Replace the plug, and all is better. If it fouls that plug again, it might be telling you it needs a valve job to fix excess guide wear (if it smokes more when idling) or a ring job as well if it shows blue grey smoke under load. Jim
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