KTM 525 carb questions

Discussion in 'The Rockies – It's all downhill from here...' started by Steelejeep, Nov 29, 2008.

  1. Steelejeep

    Steelejeep Long time lurker

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    Nov 27, 2006
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    21
    Location:
    Summit County Colrado
    Hopefully someone can help me. Last month I went to Baja and had the dealer set up my carb for sea level. Now I am setting it back up for altitude. I live in Summit County Colorado. 2006 ktm 525 EXC Keihin FCR-MX 3900F. I have the main jet done and now am stuck on how to adjust the accelerator pump. I need to adjust the stop from 1.8mm to 1mm and am lost on where you actually make this adjustment. The manual is vague and I have failed searching KTM talk, Thumper talk, Adv rider. I do not have the carb off the bike. I just have it loose and turned to the side. I am also wondering if there is an easy way to get to the clip. I need to adjust it as well. Any help would be greatly appreciated. Thanks for your time. Jeff
    #1
  2. Tha Rick

    Tha Rick Shake and bake!

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    I'd like to help here, maybe repost in thumper's?

    but I'll post my experience.

    Coming from tha factory, tha accelerator pump is really lean, cuz of emmisions to be legal.

    On my YZF's,Wr's, Crf,s, (mikuni carbs) there is a shaft that runs down to tha accelerator pump, and instead of adjusting tha pump itself, I took tha carb apart and opened tha jet .002" to get my bikes to run right.(this really helped out my CRF's)

    Tha result was I was able to "bang tha throttle like a two stroke" without tha cough and stall.


    I got this info somewhere online, and I can't remember where. Sorry for tha vague response.

    Me.

    BTW, try not to overfill tha oil on your 525, cuz there is a crankcase vent on it which goes to tha carb, unless you've done some crankcase vent mod's.
    #2
  3. Genghis Swan

    Genghis Swan Been here awhile

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    We raced a 525 in this years B1K that had previously been set for altitude. We had a JD Jet Kit and it worked great. The directions are very straight forward as to which jet to use for which altitude.
    #3
  4. unaweep

    unaweep Uses lotsa band-aids

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    Absolutely +1. I was on that bike with Rob.

    The adjustment you're talking about, I think, pertains to the little screw on the right side of the carb on the accelerator pump. You need to turn that screw in or out to achieve the desired adjustment. JD Jetting has a small O-ring that affixes to the accelerator pump to help increase the performance of the accelerator pump. Makes a big difference imho.

    But, just order the JD kit and you will never have problems with the carb again. :thumb


    #4
  5. StmbtDave

    StmbtDave AKA Invisible Dave

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    As stated before, the accelerator pump adjustment is on the right side of the carb. You will see a black, plastic cover that the throttle cables go behind. It is held in place by a single, phillips head screw. Remove this cover and you will see the disk where the two throttle cables are connected. Directly below this disk will be a screw inside a spring. The screw goes through a silver metal tab and pushes on a black plastic cam. It is the clearance between the metal tab and plastic tab you want to adjust. Back the screw out until you have the proper clearance. Don't measure from the end of the threads, rather from flat portion of the metal tab.

    When you say the "clip", I assume you mean the needle clip. This is fairly easy to change. With the carb rotated to the right, remove the two black, allen head bolts holding on the top cover. Remove the cover to expose the slide linkage. If you open and close the throttle, you will see the slide move up and down. Right in the middle of the slide is a silver, allen head bolt. Remove this bolt (with the spring on the bottom) and you will see the top of the needle. Pull the needle out and you will see the clip installed in one of several grooves. You can gently remove the clip and reinstall it in another groove. The spec's normally refer to the grooves as counting from the top of the needle; first groove will be the top one.

    Hope this helps. I just did these adjustments on my 450EXC this weekend so they're fresh in my mind.

    Dave
    #5
  6. Steelejeep

    Steelejeep Long time lurker

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    :clap
    I got it. Your description was spot on. I was making it more complicated then it needed to be (bad habit of mine).

    Thank You! Jeff

    #6
  7. Green Stainz

    Green Stainz Long timer

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    Steelejeep ,
    WAy to go you long time lurker finally came out of the closet and posted!
    #7