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Thread: Johnson Idling Problem

  1. 03-08-2011, 10:14 PM #1
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    bttmline
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    Default Johnson Idling Problem


    Ok I did it. I put a 15hp carb on my 2000 9.9. Very happy with the high end speed. BUT, I cannot get the idle down. I have adjusted the idle screw out to where it isn't even touching. If I push on it, it will slow to a workable speed. I will try the cable but was fishing for any other ideas.
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  2. 03-10-2011, 10:35 PM #2
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    bayoumonster
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    The reason could be that the idle mixture is too lean, caused by an incorrectly adjusted idle mixture needle, or a dirty idle circuit. Try adjusting the low speed rich/lean adjustment needle counterclockwise, and if that doesn't work, clean the carburetor. The fact that it's a 15carb. shouldn't affect idle as far as I know.
    Good luck,
    JBJ
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