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79 Evinrude - Spark Plugs

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  • 79 Evinrude - Spark Plugs

    Taking my new/used 1979 Evinrude 15 two-stroke out for the 1st time to troll for Kokanee & Eagle Lake strain Rainbows this weekend. Plug # on the boot is L78V and am running a 50:1 mixture - will this plug do for slow 1 - 2 mph trolling or will I be fouling plugs? What is the next hotter heat range plug I might consider?PS - lake elavation is approx. 500' above sea level.


  • #2
    Re: 79 Evinrude - Spark Plugs

    You can switch to a QL77JC4 and gap it at 0.040" for less chance of fouling at slow speeds. The L78V is a surface gap plug. I'm not a big fan of that style plug, but it is an option that is supposed to be "low fouling", but I've had better results with a st'd electrode plug. Why not compare and let us know.Good luck
    ACTA NON VERBA​

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    • #3
      Re: 79 Evinrude - Spark Plugs

      QL82C is one step hotter than the (Q)L77JC4.The UL77V has an internal gap as well as external to help prevent fouling.

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      • #4
        Re: 79 Evinrude - Spark Plugs

        Sorry for the late reply - motor ran fine and never showed signs of fouling the L78V's. Caught a nice limit of two Eagle Rainbows and three fat Kokanee!

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        • #5
          Re: 79 Evinrude - Spark Plugs

          Outstanding..........
          ACTA NON VERBA​

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