• 26:37

    M8 Softail Harley Davidson Spark Plugs Service

    Harley Davidson spark plugs service has changed with the M8. Harley M8 models have four spark plugs. Two per cylinder. This not only aids in cleaner emissions but in better performance. Two of the Harley Davidson spark plugs are located on the left side of the motorcycle where they have historically been located. These are…

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  • 13:07

    Replace Spark Plugs

    HD suggests replacing the Harley Davidson spark plugs on your M8 every two years or thirty thousand miles. Whichever scenario comes up first. The M8 has two Harley Davidson spark plugs per cylinder. Four spark plugs total. The two spark plugs on the left side of the motorcycle are easily accessible. They are basically in…

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