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    1979 CB750K Cyl #3 Plug fouled, black soot

    Hi all, I have an issue with cylinder #3 plug getting fouled at idle with black soot, not wet with gas, dry soot. - plugs 1,2,4 look good with a tan brown color, not lean or rich. - carbs were sync. and the mixture screws are at 2 turns for all 4. The bike actually likes 3 turns for all four...
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