1981 Johnson 25 hp -best spark plug

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  • July 24, 2017 at 10:48 pm #7738
    PugetSoundBoater
    Participant

      I see that the original plugs listed were Champion L77J4 ,or AC M49FFX which are not made anymore. My motor when i acquired it has NGK BZ7HS-10. I went to NAPA and had them look up these plugs,they don’t cross-reference to what i got in my motor. Marine Engine has a NGK chart,for 1980-86 OMC 25 hp,use a B9HS-10.
      So i will go with that ,unless somebody has had a better experience with a different plug. Anybody have a real favorite for this motor?
      EDIT for correct Champion # L77J4 not L77JC4
      Thanks, Jim PSB

      "Some people want to know how a watch works, others just want to know what time it is"
      Robbie Robertson

      July 25, 2017 at 3:05 pm #62176
      chinewalker
      Participant

        US Member

        Champion L77JC4 is the current replacement for the original L77J4. I use them in all my 1980s era CD ignition OMCs….

        July 26, 2017 at 4:46 am #62212
        PugetSoundBoater
        Participant

          Thats what i went out and bought today. Thats what my ’84 Evinrude 25 has in it.
          Thanks, Jim PSB

          "Some people want to know how a watch works, others just want to know what time it is"
          Robbie Robertson

          July 27, 2017 at 10:45 pm #62293
          johnyrude200
          Participant

            Use sparkplugcrossreference.com for plug conversions. I use it all the time. Great resource!

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