Question by  DisneyDreamer (22)

How do you read the spark plug color on a Harley Sportster?


Answer by  Amber40 (24961)

You want to see a slightly brown color with now build up/ Grease black carbon indicates a rich condition. White with specs of metal indicate a lean condition.


Answer by  Amber40 (24961)

If the plug clean then it is fine. If it is very white with metal fleck it is running lean. If it covered in black soot then it's rich.

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