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Idle mix or Sync, first?

Discussion in 'XJ Technical Chat' started by protomillenium, Feb 27, 2009.

  1. protomillenium

    protomillenium Member

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    After rebuilding the carbs I got my 550SECA running (barely).
    Which is next: idle mixture adjustment, or carb sync?
    Right now it goes up to 3000 rpm for 30 scnds, then down to 1500 for 15 scnds, then back up to 3000. If I run it up to 5000 for a little, it will settle down to 1500 for a little, then go back up to 3000.
    The #3 & 4 plugs look clean to whitish, the #1 & 2 plugs look oily black.
    Any clues for what to do next?
     
    protomillenium, Feb 27, 2009
    #1
  2. Ass.Fault

    Ass.Fault Active Member

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    Sounds like a Hunting Idle, the plugs should not be black and oily though.
    And 3 & 4 are too lean.
    A hunting idle like that sounds like a vacuum leak...
     
    Ass.Fault, Feb 27, 2009
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  3. a340driver

    a340driver Member

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    Clean out all the Carbs! .. look for Ricks "clean by numbers"
     
    a340driver, Feb 27, 2009
    #3
  4. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    DId you bench sync? If so you'll need to get a propane tourch. Turn the gas on and go around the carbs. If the idle smoothes out your finding the vacuum leak. How are the carb manifolds?
     
    MN-Maxims, Feb 27, 2009
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  5. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    To answer your actual question: CLEAN; Bench-sync; vacuum sync; idle mix tweak/tune/colortune/plug read/chop/read/repeat.
     
    bigfitz52, Feb 27, 2009
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  6. protomillenium

    protomillenium Member

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    Thanks Fitz, I'll look for a vacuum leak too.
     
    protomillenium, Feb 27, 2009
    #6
  7. HalfCentury

    HalfCentury Member

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    My bike ran like crap after a carb cleaning and bench sync.
    The actual synch while running made it purr like a kitten.
    I did not have the wandering idle, though. It does sound like you have air getting in where it should not.
     
    HalfCentury, Feb 27, 2009
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  8. dinoracer

    dinoracer Member

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    just make sure there is no heat coming from the propane torch first!!! DO NOT LIGHT IT!!! I hate it when people come back saying that they need a new bike because they torched it while looking for a vacuum leak... Hey at least the bike FIRED right up :) Sorry trying to cheer myself up..


    Sean
     
    dinoracer, Feb 27, 2009
    #8
  9. bill

    bill Active Member

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    Fitz I'm surprised - I thought your order was VALVES then CLEAN ......
     
    bill, Feb 27, 2009
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