Re: Johnson PO-15 Spark Plugs?

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October 27, 2016 at 8:09 pm #46582
David Stanton
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    quote Buccaneer:

    Dave, Do your plugs say D9 or 509 on them? How can they call
    them the same number if one is resistor and the other non?

    .

    I don’t remember how the plugs were marked, and I cant get to the motor until spring because of boats stored in front of it, but if you look carefully at the Champion chart you posted, D9 and 509 are different numbers for the same plug, and it is not a resistor plug. The resistor plug column to the right on the chart shows a RD16 as the only resistor plug in that "D" series.
    Dave