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'98 50HP Johnson won't idle

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  • '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
    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
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      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.