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175 Johnson Horsepower spark plug gap

"The book states the gap to be

"The book states the gap to be set to .030. If that gives you a problem, set the gap to .040.

The gap was always recommended to be .040 from around 1972 up to about 1990, then it changed to .030 . For some reason, some engines just didn't perform properly on that new recomended setting."
 
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