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  1. April 12th, 2005, 10:43 AM #1
    Jeff2012
    [OP] Jeff2012 is offline
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    Default What is the year and spark plug gap of my 15 hp Johnson

    Johnson 15 hp.Model # J15RCSDThanks.
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  2. April 12th, 2005, 10:53 AM #2
    Paul Moir
    Paul Moir is offline
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    Default Re: What is the year and spark plug gap of my 15 hp Johnson

    Welcome to Iboats!J - Johnson15 - 15hpR - Rope StartCS - 1980D - Meaningless model run code.The year code works like this:INTRODUCES1234567890So ED would be '96, since E=9 and D=6.Spark plug:Champion QL77JC4 gapped at .030". You can try opening the gap up to .040" if you do a lot of trolling/idling.
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  3. April 12th, 2005, 11:19 AM #3
    Jeff2012
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    Default Re: What is the year and spark plug gap of my 15 hp Johnson

    Thank you.
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