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How far open are XJ carb butterfly supposed to be at idle?

Discussion in 'XJ Technical Chat' started by corey manshack, Apr 5, 2018.

  1. corey manshack

    corey manshack Member

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    I just rebuilt my carbs including throttle shaft seals and still having a high idle issue. My boots look good, and I'm wondering how far open the butterfly's are supposed to be at idle? I have mine open just enough to stick a needle on the underside.
     
    corey manshack, Apr 5, 2018
    #1
  2. Timbox

    Timbox Well-Known Member

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    I would say that is a good starting point, I have used the setting before and worked well for me. I am sure there will be a few more coming along to give more advice. There might even be a setting in the "church of clean" that others have used, but your setting should be a good start.
     
    Timbox, Apr 5, 2018
    #2
  3. corey manshack

    corey manshack Member

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    Thanks! I just wanted to rule out my butterfly setting.
     
    corey manshack, Apr 5, 2018
    #3
  4. Rooster53

    Rooster53 Well-Known Member Premium Member

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    As in how high? Did you back off the idle screw adjustment located at the back of the carbs to try and bring it down?

    I like to use the transfer ports in the carb throat to bench sync:

    upload_2018-4-5_12-14-38.png
     
    Rooster53, Apr 5, 2018
    #4
    Ketchup, Timbox and Stumplifter like this.
  5. corey manshack

    corey manshack Member

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    Yes the idle screw is all the way out. Thanks for the pics! So should I verify my butterflys are similar to pic #1 at idle?
     
    corey manshack, Apr 5, 2018
    #5
  6. Rooster53

    Rooster53 Well-Known Member Premium Member

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    Yes, pic 1 is a good starting point to verify the throttle plates will fully close, and you should be able to get there on all four using the idle / sync screws. Once confirmed, set them evenly so that approximately 1/2 of the hole is visible on each carb.
     
    Rooster53, Apr 5, 2018
    #6
    Stumplifter likes this.
  7. tabaka45

    tabaka45 Well-Known Member

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    I did mine as in the pictures an it worked well for me.
     
    tabaka45, Apr 7, 2018
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