Some of the new generation JD gas engines recommended a special spark plug with an internal spark gap to lessen plug fouling. You could identify those plugs by the tiny vent hole in the metal top terminal that vented gasses formed in the internal spark gap.
A spark plug company called Aldor, takes that a bit further. Their plugs also have the internal spark gap inside the insulator, that has some sort or thermal widget that opens the internal gap when the plug is cold, then slowly closes it as the plug heats up. They claim to fire in conditions that badly foul ordinary plugs.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
... [Read Article]
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