Stalling just above idle

Discussion in 'Outboard Maintenance' started by jgregory01, Jul 11, 2010.

  1. jgregory01

    jgregory01 I Love microskiff.com!

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    I have a 99 Johnson 50hp 2 stroke. When I first got the motor last year I had to replace the computer. I also did the spark plugs and all fluids.

    It has run great except for one thing. When I put it into forward gear just above neutral it will stall out after about 45 seconds to a minute. The engine will vibrate some and just die. I need to go slow in the canals in Winter Park. All else is well.

    I think maybe I need to clean the carbs? Would this help?
     
  2. Brett

    Brett > PRO STAFF <

    Check your tachometer, it sounds like your idle rpm's aren't high enough.
    Check your manual, I set my idle rpm's while in the boat on the water, with the engine in forward gear.
     

  3. jgregory01

    jgregory01 I Love microskiff.com!

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    I dont have a tach but that sounds like it may be a solution. How would I go about setting my idle rpm? Is there a switch or something? I dont know much of anything about motors.
     
  4. Brett

    Brett > PRO STAFF <

    Idle adjustment screw,
    either on the shifter (older models)
    on the carb on most models.
    If you know very little about working on engines,
    take it to a reputable outboard mechanic for a tune up.
    If you can change a spark plug and follow instructions
    then get the OEM Shop manual for your motor.
    It'll show you what to do and how to do it.

    OEM = Original Equipment Manufacturer
     
  5. B.Lee

    B.Lee Well-Known Member

    Does it run fine otherwise? Only stalls when at idle in gear, after about 45 seconds? Probably idling too low if so.

    On land with the flush muffs attched, I assume it idles just fine? With no backpressure and no engine load it should idle nice and low without stalling, but in the water, well that changes everything!
     
  6. jgregory01

    jgregory01 I Love microskiff.com!

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    Yes it runs fine other than the issue I'm speaking of. So I need to adjust the rpm it sounds like.
     
  7. jgregory01

    jgregory01 I Love microskiff.com!

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    So I have the manual.seloc. I have looked for idle adjustment and cannot find it. Is there a technical name I should look for? The closest thing I found was the IAC valve but I don't think thata what you are talking about. Any suggestions?
     
  8. Brett

    Brett > PRO STAFF <

    try carburetor, idle setting
     
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