950 stalls once in a while

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by rubRsidedown, Jul 31, 2013.

  1. rubRsidedown

    rubRsidedown Long timer

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    My 950 just started stalling when hot while sitting at a red light.

    Tweaked idle up a smidge still doing it from time to time.

    Happened three times this evening. :huh

    My Son took it last week and said it did it to him at a red light on two separate occasions

    Thoughts?
    :ear
    #1
  2. Pete640

    Pete640 Long timer

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    Valves! I'll bet the exhausts are tight. I had exactly the same symptoms and a shim did the trick.

    Of course while your in there do the carbs/clean the throttle bodies and renew the air filter. Quick oil change and your good for a lotta Km's.
    #2
  3. Racer111v

    Racer111v Long timer

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    Mine was doing it from time to time. I did a few things at once, so here it goes. I sync'd the carbs. They were a full inch+ apart. I raised the idle about 200 rpm. I also changed the h2o seal , and fuel pump (new oem). That was done as maintenance, not looking to solve a problem.
    I haven't had it happen once since.
    #3
  4. Gustavo.Ramos

    Gustavo.Ramos Long timer

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    Check the choke cable. Sometimes might get dirty and wont retract fully, so you'll have a choked engine at idle and that can cause it to stall
    #4
  5. rubRsidedown

    rubRsidedown Long timer

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    Thanks guys, I'll check the easiest things first and go from there.

    Thanks again.

    Sent via my New England Telephone™ rotary dial device
    #5
  6. DeepInIt

    DeepInIt Long timer

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    Put some carb cleaner in your tank and clean your oil jet. done
    #6
  7. DrKayak

    DrKayak Retro Rider

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    and take it out and run it hard.

    Mine was doing it, I don't ride it enough. Ran it hard a couple of rides and it has not done it since. .. and I got religious about add fuel stabalizer to every tank... becuase I don't ride it often and the crap ethanol in the gas.
    #7
  8. rubRsidedown

    rubRsidedown Long timer

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    You know what,
    I think we have a winner here.

    I too don't/haven't been riding it as much as I should/used to. (been boating a lot on weekends and vacations so the bikes on the back burner so to speak) I bet fuel is the cause.

    I religiously add fuel stabilizer to my snowmobiles in the winter each and every fill up but for some strange reason I don't even think twice about the bike. :huh

    Thanks again for all the tips especially bringing this to my attention.
    I can't believe I didn't even give that a second thought.
    #8
  9. Katoom72

    Katoom72 Been here awhile

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    Sync the carbs, mine is doing the same at the moment and they need syncing.
    #9
  10. rubRsidedown

    rubRsidedown Long timer

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    They have been synched within a few thousands miles, can't imagine they are out but you never know.

    Sent via my New England Telephone™ rotary dial device
    #10
  11. Katoom72

    Katoom72 Been here awhile

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    By yourself?

    Sorry, i just don't thrust dealerships. :D
    #11
  12. rubRsidedown

    rubRsidedown Long timer

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    No,
    a MORE qualified person than myself.
    Unfortunatly he passed away since. :cry
    #12
  13. Katoom72

    Katoom72 Been here awhile

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    My condolences for your loss.
    #13
  14. mcmann

    mcmann Motorcycle ADV enthusiast

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    Side holes in the idle jet may be partially plugged:
    [​IMG]
    #14
  15. Tangai

    Tangai Been here awhile

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    Everything advised so far is good and might solve your problem.

    However, my 950 did the same although everything was perfectly tuned. Finally, I synchronized the carbs with the front cylinder a little ahead of the rear. On the liquid tube gages, the front cylinder is about a 1/4 inch higher than the rear. With that, my bike will idle at 1,100 RPM all day and never dies—cold or hot.
    #15
  16. Gustavo.Ramos

    Gustavo.Ramos Long timer

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    Whats the point of idling so low?
    #16
  17. Frog uk

    Frog uk Been here awhile

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    The Idle should be set at 1400 rpm.

    My 950 used to do this a lot, a full service including valves (6 of 8 were out), pilot air screws were way off spec reset to 2 1/4 turns out, balanced carbs which were miles out, took off SAS and EPC.

    Now runs perfectly, all the stalling gone away, could'nt tell you which single item caused it, but if I had to speculate I'd go for pilot screws then carb balance, followed by valves followed by SAS. Or all in combination.

    Bottom line, I think you just need a good service.
    #17
  18. rubRsidedown

    rubRsidedown Long timer

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    Once again thanks guys.

    Whats strange is this started this season out of the blue.
    My 950 has some 31000 miles on it.
    Serviced from top to bottom on a regular basis, oil changes, valves checked etc...

    I'm leaning towards the fuel thing.
    Like I stated earlier, I'll start with the easier things first and go on down the list from there.
    (I like the KISS method,
    Keep
    It
    Simple
    Stupid

    Not sure when I will be performing all this stuff but it will get some serious attention VERY soon. (unless the Mrs. wants to keep running the boat and work does't start leaving me alone soon)

    Once again thank you all for your advice.
    :freaky
    #18
  19. Tangai

    Tangai Been here awhile

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    There's no point in it idling so fast (at 1,400 RPM) if it will idle perfectly at 1,100 without stalling. The bike will run cooler at a lower idle speed.

    These bikes have a relatively light flywheel weight effect and have a tendency to stall at low speeds—so KTM suggest a high idle speed. In their thinking it’s safer. The higher the idle speed, the less likely the bike is to stall at takeoff or while waiting at a traffic light. Both can be dangerous. I don’t have a problem with either, with my 950, so I get by with a low idle speed.

    Before I “resynchronized” my carbs (as I described) I ran a high idle speed (even 2,000 RPM) but it would still die every once in a while. Very aggravating.

    My point is not to argue with anyone, you can set your idle where you want and what works for you—is the best. But, before discrediting what I suggested, [rbuRsidedown] might give it a try. It’s far easier than replacing jets or cleaning the carbs, and I bet it will work.
    #19
  20. rubRsidedown

    rubRsidedown Long timer

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    Will do, thanks!

    ;)

    Sent via my New England Telephone™ rotary dial device
    #20