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  1. #1
    Member
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    Aug 2009
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    Spark plug gap question

    I can’t read the model number anymore on my 2003 Johnson 175. I remember it starting with J 175 & think the rest of it is GLSTE, but not positive. It’s a carb motor if that helps & I know it takes champion QL78YC plugs. Was it thirty thousandths for the gap? Also what would the plug wire setb number be to replace them? Thanks

  2. Member
    Join Date
    May 2020
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    Greer, South Carolina
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    23
    #2
    Les I think CDI Electronics wire part number is 931-4921. The plug gap is .030. Please take a look to verify for yourself.

  3. Member
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    Aug 2009
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    Wichita KS
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    #3
    Yep gap at .030

  4. Sprint Boats Moderator Bassmeister's Avatar
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    May 2004
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    Calhoun, Ga.
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    46,464
    #4
    That model # aligns with an 03.

  5. Member
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    Aug 2009
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    Kings Mtn., Kentucky
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    #5
    Thanks guys.