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Thread: 25 johnson sluggish ???/

  1. 03-01-2012, 01:04 PM #1
    CSMS Gaddy
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    Exclamation 25 johnson sluggish ???/


    I have an 82-84 model johnson 25 cranks and idles fine but when i try to plain out or really drop the throttle it becomes sluggish and will hold the RPMs then drop kind of an up and down up and down i'm thinking its fuel related but with a boat motor you never know I really really need some help or a good shade tree mechanic that wont break my bank any and all help is appreciated if you have some good trouble shooting advice pm me and ill give you my phone number
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  2. 03-01-2012, 01:30 PM #2
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    CatFan
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    Try pumping the primer bulb while it's having problems. If that fixes it, try a new bulb.
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  3. 03-01-2012, 01:38 PM #3
    CSMS Gaddy
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    i tried that no luck
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  4. 03-01-2012, 02:56 PM #4
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    Quote Originally Posted by CSMS Gaddy View Post
    i tried that no luck
    did the primer bulb stay firm or was it mushy, if it was mushy? CatFan is dead onpoint replace the the primer bulb!!!!

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  5. 03-01-2012, 03:26 PM #5
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    The primer bulb is not suppose to stay firm while the motor is running. But it is not suppose to collapse. Once the motor is running it is under a vacuum because the fuel pump is sucking fuel thru it.
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  6. 03-01-2012, 10:08 PM #6
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    U can also try changing out the fittings on your fuel hose any constriction / failure on the fittings is a common culprit of this problem.


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  7. 03-02-2012, 06:30 PM #7
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    While running the motor under load when it stars to bog down slowly pull on the choke to cut back on the air flow, if it picks up some what a fuel restriction in the high speed jet is the problem, the jet is in the bottom of the float bowl and all thge crap winds up on the bottom of the float bowl.
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  8. 03-04-2012, 09:38 PM #8
    CSMS Gaddy
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    i hooked a spark tester to it very weak spark, hot battery no spark on bottom cylinder very weak on top. suggestions?
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  9. 03-05-2012, 06:59 AM #9
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    Quote Originally Posted by CSMS Gaddy View Post
    i hooked a spark tester to it very weak spark, hot battery no spark on bottom cylinder very weak on top. suggestions?
    If the spark tester is newer, it probably has a gap for a high voltage spark like an electronic ignition provides.
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  10. 03-05-2012, 09:08 AM #10
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    Going with the fuel idea, if you haven't replaced your fuel line in a couple of years, you need to. The ethanol in the fuel will take out a fuel line and cause more problems than you would think. Mine was new 2 1/2 yrs ago and I had to replace it last fall. My 150 acted the same as you describe. DON"T buy it from wal mart.
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