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fast idle after warm up....

Discussion in 'XJ Modifications' started by thorin, Mar 12, 2011.

  1. thorin

    thorin Member

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    hey all,
    the engine idles around 2000-2200 after the bike warms up. no issues when cold or start up. there is no interference issue with the throttle cable and assembly has full range of movement (fully retracts) regardless of engine temp.
    could this be a pot hanging up or such?
    the carbs where disassembled, cleaned, and re-assembled last yr when i got the bike. stock air filter is in place, straight pipe exhaust mounted this week (issue was present prior to removing stock exhaust).
    the carbs have not been synchronized yet.
    i'm taking all advice and comments....
    thanks!
     
    thorin, Mar 12, 2011
    #1
  2. PainterD

    PainterD Active Member

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    Yes, you need to synchronize the carbs, then adjust the idle down. I had the same problem with mine until Isynched the carbs and it settled right down when I adjusted the idle. You are definetely out of balance or have an air leak somewhere.
     
    PainterD, Mar 12, 2011
    #2
  3. thorin

    thorin Member

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    thank you! i was hoping that may be a contributor and not a philips screwdriver that's been missing since i rebuilt the carbs ;)
     
    thorin, Mar 12, 2011
    #3
  4. mlew

    mlew Well-Known Member

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    Have you checked for air leaks around the butterfly shaft seals and carb to head boots. A proper carb sync is also needed.
     
    mlew, Mar 12, 2011
    #4
  5. thorin

    thorin Member

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    seals looked good during rebuild but the carb to head boots do have some cracking. i guess i could spray carb cleaner around 'em and see if the engine revs...good advice!
    the bike only had 8600 miles when i got it last yr. i'll try the sync route first but probably should get some new boots.
    does chacal carry 'em?
    thanks!
     
    thorin, Mar 12, 2011
    #5
  6. WinstonC

    WinstonC Member

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    +1 on the Sync, it will cause all sorts of issues

    I had the same problem as you. I kept messing with sync for way too long until I finally got a Colortune to adjust the idle mixture,,,WOW, high idle after warmup, GONE. Well, a lot of abnormal running issues went away. I should have done it right from the start.

    Chacal has Colortunes as well
     
    WinstonC, Mar 13, 2011
    #6
  7. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    In Order:

    -VALVE ADJUST (you won't get a good vac sync with a tight valve or three)

    -Bench sync

    -Float levels adjusted using fuel and the "clear tube method"

    -Carbs back on bike; running vac sync

    -Mixture tweaking/ColorTune

    Skip anything or take any shortcuts and you'll be at it a while...
     
    bigfitz52, Mar 13, 2011
    #7
  8. KrS14

    KrS14 Active Member

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    Could it be as simple as you HAVE to set your idle when the bike is at running temp. Like at least 30 mins of riding, set the idle THEN, 1050RPM

    When you start the bike cold, that's what the choke is for, keep the revs up for idle until it's not needed for the bike to run.
     
    KrS14, Mar 13, 2011
    #8

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