Re: 1974 Evinrude 9.9 won’t idle at low RPMs, need help

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April 25, 2016 at 7:31 am #35452
frankr
Participant

    You can take a UL81C and file the ground electrode off so it only extends half way across the center electrode and you have a UL81J The end of the filed-off electrode presents a sharp edge for the spark to jump to. Most of us know that a spark jumps to a sharp edge or point easier than to a flat one. That’s why lightning rods are pointed. The lightning prefers the pointed rod over the flat roof top.