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Idle Speed Adjusment

Discussion in 'The Garage' started by Dennis Moore, Sep 8, 2023.

  1. Sep 8, 2023 #1
    Dennis Moore

    Dennis Moore XS400 Enthusiast

    38
    4
    8
    Columbus, Ohio
    Guys. The Idle speed adjuster screw on a '79 XS400 gets turned in to increase idle speed, right?
     
    Dennis Moore, Sep 8, 2023
    Dennis Moore, Sep 8, 2023
    #1
  2. Sep 8, 2023 #2
    CaptChrome

    CaptChrome XS400 Addict Top Contributor

    382
    140
    43
    Southern NJ
    It gets turned out (counter or anti-clockwise) to increase idle speed. On the Mikuni BS34 carb, the screw is a fuel adjustment, so turning it out adds more fuel which increases speed.
     
    CaptChrome, Sep 8, 2023
    CaptChrome, Sep 8, 2023
    #2
  3. Sep 8, 2023 #3
    Dennis Moore

    Dennis Moore XS400 Enthusiast

    38
    4
    8
    Columbus, Ohio
    Thanks.
     
    Dennis Moore, Sep 8, 2023
    Dennis Moore, Sep 8, 2023
    #3
  4. Sep 9, 2023 #4
    CaptChrome

    CaptChrome XS400 Addict Top Contributor

    382
    140
    43
    Southern NJ
    You're welcome. Just one other caveat here: I was referring to the idle mixture screws on the carbs (one on the top of each carb). If you are referring to the common idle speed adjuster under the middle of the ganged up set of carbs, that one controls the butterfly valves and turning it clockwise opens the butterflies more which will increase speed. Hopefully I didn't mess you up there!
     
    CaptChrome, Sep 9, 2023
    CaptChrome, Sep 9, 2023
    #4
    tstidham likes this.
  5. Sep 11, 2023 #5
    Dennis Moore

    Dennis Moore XS400 Enthusiast

    38
    4
    8
    Columbus, Ohio
    Yes. That's what I was asking about not the mixture screws. Thanks, CaptChrome
     
    Dennis Moore, Sep 11, 2023
    Dennis Moore, Sep 11, 2023
    #5

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