KLR High Idle

Discussion in 'Thumpers' started by ahwarm, Dec 17, 2012.

  1. ahwarm

    ahwarm Adventurer

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    Jun 27, 2012
    Oddometer:
    40
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    Ontario, Ca
    2004 KLR idles at about 1,200 rpms when warming up while cold. After some time on the highway it now idles at 1,800 to 2,000 rpm? Does this seem odd? Just doesn't feel right to me idling that high.
    #1
  2. SoSlow

    SoSlow Having fun

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    Is your choke cable binding up? I realize it isn't quite the same thing but I was having a heck of a time starting my 2009 on really hot days this summer until I lubed the choke cable - it was sticking a bit and the bike was running really rich with a high idle.
    #2
  3. davidb21

    davidb21 Adventurer

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    might be that your pilot jet is dirty, my idle was jumpy when my pilot was dirty, it would stay at around 2k rpm when i pulled up to lights for a little and eventually go back to the 1.5k rpm or so
    #3
  4. Aprilia

    Aprilia Long timer

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    All the above plus check for vacuum leak on the intake side of the carb.
    #4
  5. XDragRacer

    XDragRacer Long timer

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    Agree to all the above.

    An intake leak, as suggested by Aprilia above, might be a function of a crack widening with temperature.

    Also, as stated by SoSlow, "choke" (starting enricher) plunger must seat fully in carb for normal idle.
    #5
  6. Unstable Rider

    Unstable Rider Moto Fartografist

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    I gotta ask - are any type of "handlebar risers" part of the equation?
    #6
  7. Kbowling

    Kbowling Been here awhile

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    Sounds like a classic lean condition,maybe dirty carb,idle screw misadjusted,ir vaccuum leak are the most common causes
    #7
  8. Myfuture_yourdebt

    Myfuture_yourdebt Banned

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    How exactly are you starting and warming up the bike (particularly in regards to the choke)?

    1200 RPM is a low cold start idle and I believe Kawasaki recommends 1400 for idle speed (after warm up) for the KLR650. With full choke it should be starting and idling around 1800-2500 RPM in my experience.
    #8
  9. ahwarm

    ahwarm Adventurer

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    I normally do not use the choke at all to start the bike. And while it warms up it's around 1200rpm. When I do use the full choke it idles pretty high. Around the 2500rpm and I always find that kind of high so I hardly use it. Should I be using the choke every time with the cold temperatures lately for my region ( Southern CA)? 39-48 degrees in the mornings.

    Andy
    #9
  10. TexaNate

    TexaNate Been here awhile

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    I was having a similar problem with my TW200. Tried a bunch of carb fixes to no avail, then I put some Sea Breeze in the gas tank and it improved drastically after a few rides. Might be worth a shot before you take apart your carb.
    #10
  11. itsatdm

    itsatdm Long timer

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    Different bike with the same carb. I noticed my idle speed has picked up a little recently. Not only has it turned colder, California has just switched over to their winter gas formula. Could be nothing more than that.

    The purpose of the enricher valve (choke) is to let more gas into the carb to aid starting. If your bike starts without it, no purpose to use it.

    You should have a mechanical screw device to open or close the throttle to get proper idle speed when the bike is warm. I would lower the rpm using that. I suspect once you have done that, it will require some choke to start it.

    If that solves it, repeat in the spring.
    #11
  12. XDragRacer

    XDragRacer Long timer

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    I thinkg the "choke" (starting enricher), when activated, functions as a "mini-carburetor," admitting both air and fuel (in a fuel-rich mixture) to aid in starting.

    Both air (vertical flow, from high to low) and fuel (horizontal flow, from left to right)entering the carburetor is shown in this diagram:

    [​IMG]
    #12