The fouling is what leaks off the voltage before it can build enough to jump to the ground electrode. The electrons see a different path and go there as though it was easier than jumping the real gap. The path is almost always (today) down the side of the porcelain insulator. Putting a wide gap to the ground electrode actually makes it easier to foul. A good running engine with a good air cleaner. will not deposit material on the insulator. If it tends to foul plugs, it probably needs service. Higher heat range plugs can mask the issue for a while, but not if worked hard, as the plug will probably cause preignition. Jim
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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