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  1. #1
    Cadet
    Join Date
    Aug 2003
    Location
    Houston
    Posts
    24

    Default '98 50HP Johnson won't idle

    My 50HP Johnson will idle while on the muffs but won't when in the water. How do I advance the idle speed?Thanks,Keith

  2. #2
    DJ
    Guest

    Default Re: '98 50HP Johnson won't idle

    Advancing the idle speed is masking the symptom, not repairing the problem.Most likely, you are running on one cylinder-only.1. Check spark, on both. Should jump 1/2" with strong blue spark.2. Check compression on both. Should be over 100 and very close to each other.If both of those are OK, you probably have a fouled carburetor, for that cylinder.

  3. #3
    Cadet
    Join Date
    Aug 2003
    Location
    Houston
    Posts
    24

    Default Re: '98 50HP Johnson won't idle

    Hello,I had the boat in the water last night. The motor idles nicely while in neutral, but won't idle while in gear. When I put it in gear, I have to give it a little throttle to keep it from stalling. The motor runs great once I get above idle speed. Comes up on plane with no trouble. Runs strong while on plane. According to GPS I hit 33mph with no stumbles or sputters at all.

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