I'm under the impression, that to find out what the spark plug gap should be, you would try to retrieve an accurate measurement of the spark from the plug it's self using a wooden ruler, then divide that by the compression ratio. Say, if the spark was .500" and divide that by actual compression ratio.
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IH CUB CADET 1450, 72, 86, 1211, IH #2 CART, IH 56" SNOW BLADE, COLLECTING CUB CADET ENGINES
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