Reply To: Light four imperial

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March 4, 2020 at 4:56 pm #196654
Buccaneer
Participant

    US Member

    Are your plugs holes 18 mm?
    According to this chart, a 5M Champion, which I assume
    is the same as a M5, is 18 mm, and is on the cold end
    of the heat range.

    Champion-Spark-Plug-Charts

    Prepare to be boarded!