990 Jerkyness - Or how I Un-Jerked my bike

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by DSM8, Feb 27, 2009.

  1. britespark

    britespark n00b

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    I was thinking of doing this myself. I assume the cable end has to be moved closer to bar, and the groove tapered out to the original diameter. How low did you go?

    Mine became a bit jerky recently. The cure was to adjust the chain! Worth a check if yours is misbehaving.

    P.
    #21
  2. G-Funk

    G-Funk That ... Umm ..... "Dude"

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    Me - I've done the G2 - 400 cam, and it's helped some.

    I've been told that the "jerk" mellows around 12000 miles or so. I've got 7k on my 990 right now.

    Well, last weekend a bunch of us were out riding on stuff like this;

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    And I gotta say - that where I wanted to be, naturally, in 2nd, I couldn't.
    There was just way too much Jerk still for my liking, so I had to up it to 3rd and be in a lower rpm range, and I really had to work it .... which I didn't like.

    So next for me is the 16t sprocket ....... and then I'm gonna check it out again. If it's still No Bueno - the butterflyorectomy.

    Then and only then will I dyno it ......

    I can say, that when I was in the proper rpm range in 3rd, where the terrain warrented the speed - the bike was FREAKING AWESOME ...... :lol3

    I'll keep ya all posted ...... :1drink

    G.
    #22
  3. azkiwi

    azkiwi message in a bottle

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    Just go ahead and do them both. You'll notice a big difference from the 16T and a small difference from the ectomy.
    #23
  4. Pete156

    Pete156 I love to eat!

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    All this talk and all these threads about the jerky 990 throttles, and they've been out for nearly 3 years!


    Damn, I'm so glad I bought a new 950. Smooth as silk right from the bottom to the top.
    #24
  5. CHRIS_D

    CHRIS_D Been here awhile

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    The thing that gets me is that I purchased the 990 because I didn't want have to fool with typical carb hassles of warm up time, stalling when cold, etc. Let see I still need to do all this and it's fuel injected.:eek1 :eek1 How long has fuel injection been out now, this is not a new technology! Lets get it together KTM! I too should of just purchased the 950 instead and saved my self a couple of grand!
    #25
  6. azkiwi

    azkiwi message in a bottle

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    And do you have these issues? :ear

    Hit the button, zip up your jacket, put your helmet on, put your gloves on. Ride away. How hard is that? :dunno
    #26
  7. CHRIS_D

    CHRIS_D Been here awhile

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    WHAT's hard about is that I have owned 3 other FI bikes (one of them was a V-twin) and have never ran into a problem like this before. I have adjusted my routine to allow for some warm up time and it has happen very little now. Don't get me wrong I really do enjoy this bike! In fact it's the most fun I have had on a bike in a long time:clap !! However, IMO who ever wrote/designed the FI system had their head up their ass. Lets face it, FI bike aren't suppose to stall when their cold. Besides as much as I ride I waste a lot of gas letting it warm up every time I start it. Oh well, I guess it gives my "Big Ugly Katoom 990" even more character!:lol3
    #27
  8. azkiwi

    azkiwi message in a bottle

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    I'm not disagreeing - my VStrom was well sorted even though dealing with the same problem set (making it lean enough to pass emissions but rich enough to run) - but even when I impatiently just hit the button on the KTM and ride away it has never been tempted to stall. It just seems to run a bit smoother if it gets a two-minute warm up.

    I do have the secondaries removed.
    #28
  9. wakked1

    wakked1 Aspiring Itinerant

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    So I removed the secondary butterflies and took for a spin around town. I have to say its a big difference, in a very specific & subtle way. On/off throttle transitions are a lot smoother, I'm guessing the secondaries were causing some turbulence and/or were a bit slow open opening when you got back on the throttle. So city riding is significantly improved IMHO. Not bad for 20 minutes of work. Just beware that the screws holding those butterflies on are pretty soft and can strip easily.
    #29
  10. Snowmoto

    Snowmoto n00b

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    Hi,

    Have you watched the engine temp? Any change caused by removing the butterflies? Probably you don't have an info for an effect in a fuel consumption yet, but please let us know, when get some.

    Most likely the smooth behavior comes that the secondaries are not there blocking the air flow in slight engine braking.

    My experience is that 990 has two modes:
    1. it is brilliant in all ways
    2. slight (and adjustable) engine braking is missing - when the fault (blocking) is on, it is always like total cutdown, even you make only tiny movement on a grip to brake little with the engine. That makes the point in the gas, where the bike does not know is it going or not. It comes very difficult to handle at slow speeds - even bit dangerous.

    Mode 1 can be restored with famous "15 min idle trick". Also allowing it warm 2 - 3 bars helps. Still, sooner or later it will go to the mode 2.

    Now when your butterflies are removed, can you get the bad mode on anymore?

    - Snowmoto -
    #30
  11. CHRIS_D

    CHRIS_D Been here awhile

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    I will have to give this a try. :clap
    #31
  12. G-Funk

    G-Funk That ... Umm ..... "Dude"

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    Lovely .....

    Tomorrow my 16t comes in, and then I plan to install that, and remove the butterflies this weekend, or sooner, if time permits ......

    Maybe I'll remove the butterflies first, before installing the 16t and take it for a spin. With how I know my 2nd gear is responding (w/the jerk) it should become apparent real quick like what the diff. is with the b.f.s removed.

    I'll keep all of ya posted ......

    G.
    #32
  13. G-Funk

    G-Funk That ... Umm ..... "Dude"

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    Crazy that 2 months have just about gone by .......

    Here's my update, and where I'm at with my 990 .....

    I received my 16t, and started into the bike, just to find that it all had a 16t on it ...... :bluduh

    So with the G2 - 400 cam - and a 16t, I was not pleased .......

    Tried out the 200 cam, and like the 400 better ....

    I talked to the guys down at my local KTM dealer, and they suggested on holding up regarding removing the butterflies - so they're still in at this moment.

    I ordered the Kaoko throttle controller, about 10 some days ago, received about a week ago ..... I was in the process of working on my Africa Twin, so the Kaoko had to wait a spell ....

    I installed it yesterday - took all of like 8 minutes ....

    Then with some minute adjusting, I tightened it down to where I thought it was slightly adding friction to the throttle, but so much that it wouldn't snap close if I took my hand off the throttle ......

    I then put it through some tests on both pavement with some tight turns, speed bumps, etc .....

    Then I took it on a little gravel and checked out the dreaded 2nd gear / 3rd gear snappy / jerky throttle.













    WOW. :thumb

    By adding a slight amount of friction on the throttle, it became much, much smoother ...... much smoother. :beer

    In the urban environment, in 3rd, down shifting into 2nd to go through a turn and hitting the throttle, as well as, being in either 2nd or 3rd, and hittin' a bunch of speed bumps, there was no fluxuation on the throttle, and no jerk.

    Same with gravel, and having to juice it at times, etc ...... and then taking it easy to check on the finese of the throttle.

    I still need to have a light-er-esqe touch with the throttle, but no longer a "feather" touch .......

    If you hit it hard in 2nd, she goes, as is expected, but hittin' it, and then coming into some washboards, you can easily maintain and keep steady revs.

    It might seem odd that you have to add a friction based device to your throttle, but by Gawd, it works ....... :thumb :lol3

    From what one poster said about their 690, there's just to much loose / free play with the throttle tube. This eliminates that "free" play, thereby it eliminates the jerk / snap to a big whoppin' degree.

    Best 110 bucks I've spent for the bike ...... :D Plus you can do up very finite degrees of friction with the thing .... so it's very adjustable.

    I have no intention of using it as a cruise control device, but to tighten down that free play on the throttle, well ......... it's awesome.

    And that is how I have unjerked my 990 ............ :1drink

    G.
    #33
  14. Gimme 2

    Gimme 2 wheels , with nobs

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    get some one else to ride it:rofl
    #34
  15. G-Funk

    G-Funk That ... Umm ..... "Dude"

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    :stupid :lol3

    :beer

    Seriously ............... There was a great deal of play in my throttle.

    My 620 isn't like that.
    My DRZ isn't like that.
    And my AT isn't like that ........

    My Elefant wasn't like that.
    My 96 Tiger wasn't like that.
    My Transalp wasn't like that.

    It may be personal preference, but I didn't like how the throttle worked, specially on snotty 2 track ...... or wet / slick leaves ........ etc .......

    I know some peeps, that they've not had a problem, or issue, with it.
    I've known other peeps that have done a ton of shit to correct the problem.

    Obviously there's an issue ....... and not on all 07s ....


    Just Sayin' ...............

    G.
    #35
  16. Fluffycat

    Fluffycat Been here awhile

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    As for not like it's.......My SP1 is not like it....and that is saying something:D
    #36
  17. naughtydirt

    naughtydirt n00b

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    sounds like a good idea.
    where do i get info on the power commander. is it something i install myself or is it something the dealer installs?
    does it invalidate the warrentee?
    #37