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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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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