Reply To: Light four imperial

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March 4, 2020 at 5:05 pm #196658
Buccaneer
Participant

    US Member

    I see RD16 is 18 mm, but a resister type plug, which I’m told to avoid in magneto
    type outboards.
    This chart say you need a Champion 509 or D9…..

    Champion-Spark-Plug-Replacement-Chart

    Prepare to be boarded!