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  1. #1
    Join Date
    Oct 2008
    Location
    Abbott, TX, USA
    Posts
    39

    Default 1994 Johnson 90hp issue

    Ok buddies boat has an issue, trying to sort it out.

    We ran it today, started perfectly...ran it for about 10 minutes max, got up to 44mph at 5100rpm. Slowed down going into a cove, cut the engine off to piddle around. Piddled around for about 15 minutes and went to start engine to leave and it wouldnt start. Hasnt started yet, wont even try. I figured it was an electrical issue and was just going to verify when we got home so pulled the plugs and turned over and all are sparking bright blue. So a fuel issue? What in the world could have happened in that short time from running perfectly, to nothing at all? We killed the engine on our own will.

    Any pointers would help.

    I dont have a compression tester, but almost positive the compression on the engine is fine. I can go get one tomorrow...but even if it was a compression issue, wouldnt the motor at least start, or try to?

    I was totally expecting for it to not have any spark...but it wont start on muffs right now either, but spark plugs do have spark.

  2. #2
    Join Date
    Apr 2010
    Posts
    4,532

    Default Re: 1994 Johnson 90hp issue

    Your spark has to jump a 7/16" open air gap on a spark tester. Spark plug testing means nothing. Also get that compression checked.

  3. #3
    Join Date
    May 2011
    Location
    slough ,berkshire uk
    Posts
    161

    Default Re: 1994 Johnson 90hp issue

    +1 on the above...

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