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  1. #1
    Cadet
    Join Date
    Jan 2011
    Location
    Utah
    Posts
    1

    Default Help!'93 9.9 Johnson won't start when warmed up

    I have a '93 9.9 Johnson, and am the only owner. The motor will start cold and run well, but if I turn it off it won't start unless I let the motor cool down, which takes a couple of hours. Can anyone tell me where to start?

  2. #2
    Ensign
    Join Date
    Mar 2010
    Location
    Poland/Białystok
    Posts
    931

    Default Re: Help!'93 9.9 Johnson won't start when warmed up

    Hi.
    i would do in this way:
    1. warm up the motor up to when its dificult to restart.
    2.check the compresion imidietly
    3.if compresion is good and even then check spark with spark tester.
    if spark is bad, change spark plugs,spark plugs cables(2 cables and caps ofcourse)
    after change check spark by spark tester.
    if it not help powerpack or coils might be bad
    sometimes its good to use transparent fuel hose leadind from fuel pump to carb, to see how fuel pump works and how much fuel pump during work.

    i think this can happen if engin loose compresion becouse bad head gasket or powerpack/coil is working bad after warm up

  3. #3
    Master Chief Petty Officer
    Join Date
    Dec 2010
    Location
    savannah ga
    Posts
    881

    Default Re: Help!'93 9.9 Johnson won't start when warmed up

    yep what he said and id bet on a power pack they do that when they warm up -ALOT

  4. #4
    Ensign
    Join Date
    Mar 2010
    Location
    Poland/Białystok
    Posts
    931

    Default Re: Help!'93 9.9 Johnson won't start when warmed up

    the best way to check powerpack is to swap powerpack from similiar motor(2 cylinder type,will fit powepacks from 4hp to 40hp) and take a run

  5. #5
    Lieutenant Commander kbait's Avatar
    Join Date
    Nov 2007
    Location
    lk mtka, mn
    Posts
    1,639

    Default Re: Help!'93 9.9 Johnson won't start when warmed up

    I'm with the cd box failing, but there's also a trigger and a charge coil under the flywheel. I've heard they could also fail under higher temps. If you search this forum, you'll likely find a way to check them with a multimeter (after confirming no spark condition..) Good luck!
    It's almost beyond the point of bearable how torturous it is to try to have any dignity in being a Vikings fan..

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