Ralle-moto mdc damper rebuild

Discussion in 'KTM 950/990' started by Fierce Beagle, Sep 12, 2019.

  1. Fierce Beagle

    Fierce Beagle Been here awhile

    Joined:
    Mar 20, 2016
    Oddometer:
    120
    Location:
    Lake Norden SD
    I have on-again off-again hang up on my steering for the 2010 990R. Most advice points me toward steering head bearings, the bike has 50,000 on it. I have a Ralle-moto mdc damper on it and am more suspicious of that than the bearings because of the way the issue feels. It feels like a dampening effect resisting my steering away from center. Like if you were walking and leaned to take a step and found you weren't able to move your feet for a split second. It feels this way even if I have it turned to setting 1.
    Anybody able to point me to a rebuild kit or information on the damper.
    This winter I will tear one or both of the bearings and damper and rebuild.
    thanks
    #1
  2. DirtyADV

    DirtyADV Long timer

    Joined:
    Jan 13, 2007
    Oddometer:
    4,184
    Location:
    SWEDEN, Norsjö
    Arm from damper binding on pin?

    Caused odd feel on my friends 525.

    Light touch with sandpaper in the slot on the arm and all feels fine after that.

    /Johan
    #2
  3. Fierce Beagle

    Fierce Beagle Been here awhile

    Joined:
    Mar 20, 2016
    Oddometer:
    120
    Location:
    Lake Norden SD
    I’ll check it out and give that a shot, thanks!
    #3
  4. GezwindeSpoed

    GezwindeSpoed Been here awhile

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    Jan 15, 2009
    Oddometer:
    974
    Location:
    The land of the Dutchmen
    Can you take the damper off easely to check if it is the bearings or the demper

    I have never service my Scotts damper in 7 years
    #4
  5. Fierce Beagle

    Fierce Beagle Been here awhile

    Joined:
    Mar 20, 2016
    Oddometer:
    120
    Location:
    Lake Norden SD
    Took off the damper tonight, definitely the culprit. On the lowest setting, moving it by hand is catching.
    Steering bearings feel great with damper removed.
    #5
  6. 1coolbanana

    1coolbanana Long timer

    Joined:
    Aug 25, 2009
    Oddometer:
    5,613
    Location:
    NW Sydney, Australia
    Ralley Moto dampers are absolute rubbish, I had 3 fail and 2 replaced and when I stripped the third, I was shocked, its total rubbish.
    Bin it and fit a Scotts.
    I have photos of it disassembled if you wish to see the pathetic design and poor machining.
    Sorry, but they are a thorn in my side!
    #6
    Wonkyconk likes this.
  7. LTKernel

    LTKernel jack of all trades... Supporter

    Joined:
    Nov 14, 2013
    Oddometer:
    411
    Location:
    Utah
    I have had an RM1 on my 990R for almost five years. I am satisfied with it and I have ridden it plenty through ruts, rocks, and deep sand. It is now leaking, but a couple offs that tweak the steering sharply and those seals are challenged to contain the force of that oil moving quickly. Of course, I probably should have serviced it sooner. I use Scotts on my two smaller bikes.

    You can contact Ralle Moto and ship it back and forth to AU at great expense, or source the o-rings, a screw, and oil yourself and do it. PM me with model if you want instructions and let's keep in touch about sourcing parts. It's going to be a winter project for me soon.
    #7
  8. 1coolbanana

    1coolbanana Long timer

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    Aug 25, 2009
    Oddometer:
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    Location:
    NW Sydney, Australia
    There are no seals or bearings, its metal to metal and O rings.
    Very piss poor design.
    Dont be surprised if its full of swarf as well.

    I have all the disassembly pictures if anybody requires them.
    #8
  9. LTKernel

    LTKernel jack of all trades... Supporter

    Joined:
    Nov 14, 2013
    Oddometer:
    411
    Location:
    Utah
    Who said anything about bearings? An o-ring is a seal.
    #9
  10. 1coolbanana

    1coolbanana Long timer

    Joined:
    Aug 25, 2009
    Oddometer:
    5,613
    Location:
    NW Sydney, Australia
    An O ring is designed as a static seal , not for rotating or sliding shafts, its a terrible cheap and nasty way to do it.
    Have a look at a quality unit like a Scotts and you will see how disgraceful the design and build is of the RM units.
    The RM is even worse than that, it uses the O ring AS the bearing and the seal on a single sided unsupported shaft.
    They are a rubbish design, designed by people who have no clue no matter how you look at it.
    #10
  11. Fierce Beagle

    Fierce Beagle Been here awhile

    Joined:
    Mar 20, 2016
    Oddometer:
    120
    Location:
    Lake Norden SD
    Here are pics of my damper model. Looking for rebuild data.

    Attached Files:

    #11
  12. 1coolbanana

    1coolbanana Long timer

    Joined:
    Aug 25, 2009
    Oddometer:
    5,613
    Location:
    NW Sydney, Australia
    Its a very simple unit.
    Theres nothing much to replace except O rings and the oil.
    Just carefully take apart, it will all be pretty obvious when you disassemble and youve got it in bits.
    Just be careful with the lid O ring.
    #12
  13. Cafeducati

    Cafeducati Stuffing my face with that 990 Steak

    Joined:
    Oct 10, 2011
    Oddometer:
    89
    Location:
    Pacific NW
    Plz send me the rebuild data and pics if able.

    I have the same unit and mine does not have any issues,... yet.
    But in the case that it does, I would like to have to option to rebuild it.

    Please and Thank You
    #13