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Air screw clairifacition

Discussion in 'XJ Technical Chat' started by Madmur, May 9, 2010.

  1. Madmur

    Madmur New Member

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    Is this correct for an XJ750 Seca with Hatachi carbs,

    Air screws in = more fuel
     
    Madmur, May 9, 2010
    #1
  2. Madmur

    Madmur New Member

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    I DUNNO!
     
    Madmur, May 9, 2010
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  3. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    No, you've got it backwards........
     
    chacal, May 9, 2010
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  4. Madmur

    Madmur New Member

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    ok thanks
     
    Madmur, May 9, 2010
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  5. Fraps

    Fraps Member

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    I assume you are talking about the idle mixture screws...

    Turning the screws in (clockwise) = less fuel (because it blocks the orifice at the bottom more).

    Nice to see a fellow XJer so close too!
     
    Fraps, May 9, 2010
    #5
  6. RickCoMatic

    RickCoMatic Well-Known Member

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    NO.

    AIR Screw IN = Less Air = Less Fuel (with it) = Lean

    AIR Screw OUT=More Air = More Fuel siphoned-up = Rich

    On that 750 Seca ... Don't do "Turns"
    Try "Depth"
    From the Top of the carb Housing -to- the Top of the Screw:
    Preset: 11/64ths.
    That might be on the Lean side.
    9/64ths might be "Money".
     
    RickCoMatic, May 9, 2010
    #6
  7. MiCarl

    MiCarl Active Member

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    Technically it's not an air screw. While it's not a fuel screw either, it behaves like one - in = less fuel = lean, out = more fuel = rich.
     
    MiCarl, May 9, 2010
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  8. RickCoMatic

    RickCoMatic Well-Known Member

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    http://www.cyclepedia.com/pilot-air-screw/

    Old timer's call them AIR Screws.
    A few refer to 'em as: "The Idle's"
    We call them Pilot Mixture Screws, ... correctly?

    I never called a Main Fuel Nozzle an Emulsion Tube 'til somebody else said that Technically that what they were called.
    Now, everybody thinks the Nozzle is a Tube.
    We do what gets the job done.
     
    RickCoMatic, May 9, 2010
    #8

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