Reply To: 1955 25hp Johnson RDE-17 spark plugs

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May 3, 2021 at 11:04 am #237577
David Stanton
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    Two differences between J6J and J6C. The C means copper electrode, and the right angled gap bar extends a slightly different length over the center electrode pin. You can file this part down to make a J6C look like a J6J, but I don’t think it’s worth the trouble.
    Dave