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straight pipes

Discussion in 'XJ Technical Chat' started by ETS59, Sep 16, 2010.

  1. ETS59

    ETS59 New Member

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    i put straight pipes on my xj750 maxim looks good and sounds good i like but i am afraid that it is running lean not sure starts fine and idles fine i think it runs good checked the plugs and they are closer to white i am worried about long term affects on the motor how can i adjust the carbs without messing everything up seeing that all seems to be ok right now where is the adjustment screw
     
    ETS59, Sep 16, 2010
    #1
  2. Cmccully04

    Cmccully04 Member

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    you will need to cahnge jets in your carbs. You can get the jets from our local XJ guy. Chacal.
     
    Cmccully04, Sep 16, 2010
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  3. RickCoMatic

    RickCoMatic Well-Known Member

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    You KNOW the jets in it need to be upped.

    If you dont want to wait for New Jets to arrive via Post, ... you can Drill the Jets you have to make them a larger value.

    [​IMG]
     
    RickCoMatic, Sep 17, 2010
    #3
  4. jeffcoslacker

    jeffcoslacker Member

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    Mixture screws on any carb only control IDLE mixture...they have no effect the moment the throttle plate is opened..

    Rejet as suggested...
     
    jeffcoslacker, Sep 19, 2010
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  5. Zookie400

    Zookie400 Active Member

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    search for straight pipes and you will get a huge list of threads to read through.
     
    Zookie400, Sep 20, 2010
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  6. RickCoMatic

    RickCoMatic Well-Known Member

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    Actually, ...

    Our Pilot Mixture Screws DO more than just let the Bike Idle.

    The Mixture Screw also supplies: Supplemental Richness

    At the Instant the THROTTLES are OPENED there is a rush of Fresh Air introduced to the Combustion Chamber.
    >>Three and a half to four "Rapid Eye-Blinks" in duration.

    If the Mixture Screw is not adjusted to allow Fuel to BLEED into this Air Stream ... the Engine DOES NOT smoothly transition OFF IDLE.

    Properly Adjusted the Supplementary Fuel lets the Engine not miss a beat.

    Too Lean and there is HESITATION awaiting the MAIN JET Supply.

    Too Rich and the Engine STUMBLES and Boggs-Out.

    Fine Tuning the Pilot Mixture Screw also determines the GROSS Fuel Delivered to the Engine and changes the AIR-FUEL Ratio.

    You can find the "Window of Fine Tuning" ... which is within 12-Degrees.
    Probably less.

    The Mixture can be adjusted to make the Bike Run:
    <<<[ Critically Lean <> Distructive
    <<<<[ Lean <> Hot, Explosive Mixture, Fast, Performance, No Coasting
    <<<<<[ 'Normal' <> A fine mixture for performance + Cruising, Coasting
    <<<<<<<[ Rich <> Deliberately Tuned Rich for Cooler Running
     
    RickCoMatic, Sep 20, 2010
    #6

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