KTM 690 Suspension

Discussion in 'Thumpers' started by bruceca2002, Jun 9, 2013.

  1. bruceca2002

    bruceca2002 Been here awhile

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    Dec 6, 2003
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    I picked up a new 690 and so far I love the bike except for the suspension. Riding over wash board is brutal and I need help from some suspension experts. I weigh 260 pounds and so far all I have done is put a stiffer spring on the shock and turn out the front and rear compression damping screws. Any info is appreciated. Cheers, Bruce
    #1
  2. DirtSolace

    DirtSolace Been here awhile

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    at 230 lbs (with gear) and a 8.8 Slaven spring. I have gone in the soft direction and gotten way better performance than when I had everything tight... In phases (after new spring) I've gone from 13 clicks to 20 and it feels lighter and turns better--yet, it does not feel soft....
    #2
  3. Yellow Pig

    Yellow Pig Allergic to asphalt!

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    The front sucks and is set-up for street riding. in my opinion a re-valve is mandatory. The rear is OK, just needs a heavier spring.
    #3
  4. CanadianX

    CanadianX Oh!? That is deep.

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    could also try changing the fork oil to a heavier weight.
    #4
  5. NovaMoto

    NovaMoto Been here awhile

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    Once you re-valve the front and select springs for your weight it becomes a different bike. That is a >1,000$ solution though if you can't do the work yourself!
    #5
  6. Bill the Bong

    Bill the Bong Supern00ba

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    Try 5w fork oil with an air gap of 110-115mm. Compression completely open, then in 2 - 3 clicks. Rebound 10 to 15 clicks open.

    Rear - try to get balance with the front :norton

    By the way, it becomes better just before its time for a rebuild...
    #6
  7. gen

    gen Been here awhile

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    #7
  8. Albie

    Albie Kool Aid poisoner

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    Not if you find a good suspension shop that doesn't feel the need to rape you.
    Revalve forks, and shock, respring shock (fork springs are way stiff enough for most riders), cost me less then $500 from SMS Racing.
    #8
  9. brianpc

    brianpc Been here awhile

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    Anybody have measurements for the heavier rear spring on the shock? Or, a link on where to order / what type of spring it is? My suspension guy was going to order one for me and the spring shop says they don't have measurements for the '13 690 rear?
    #9
  10. bruceca2002

    bruceca2002 Been here awhile

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    Location:
    Napa North, Okanagan Valley, Britsh Columbia
    I weigh 260 lbs in my birthday suit. With all my gear, backpack and a extra 15 pounds of weight from my RR tanks, I am probably close to 300 pounds.

    The bike came with a 8.0 n/mm rear spring. I then tried a 10.0 from Super Plush that seemed to make no noticeable difference. I have now installed a 13.0 spring from my Super Enduro and I get proper sag numbers with 10 mm of spring pre-load. I will try this out this weekend. The KTM manual calls for 18mm of spring pre-load which seems to be excessive IMHO.

    The front forks seem to have a closer spring rate but also have very stiff valving resulting in a very harsh action.

    Maybe a suspension tuner will offer some info as what is wrong with the valving on this bike!!!
    #10
  11. Yellow Pig

    Yellow Pig Allergic to asphalt!

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    How complicated/involved is it to convert the 2012+ rear shock to full 300mm travel?
    #11
  12. Baja Dad

    Baja Dad Long timer

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    send it to BOB BELL at Precision Concepts
    or buy the NEW shock from Rally Raid UK
    #12
  13. DuctTape

    DuctTape Been here awhile

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    I have and used the shimstacker software to re-valve (Gold) my 990 and the 690 is next. If anyone knows the stock shim stack I could put the shims in the software and then upload what it shows and also play around with differnt stacks, oil weight, etc.

    The following pic shows 3 different stacks with the dark dotted line being the soft stock stack the 990 comes stock with. The yellow line is the updated stack.
    [​IMG]
    #13
  14. Velociraptor

    Velociraptor TrackBum

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    Put me on the list for the fork kit!
    #14
  15. gen

    gen Been here awhile

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    #15
  16. AccelRus MaxiMus

    AccelRus MaxiMus Been here awhile

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    I assume you were referring ^^ to the 690's ?

    Same lenght tubes = surprising to me since the KTM
    manuals list such different fork and spring lengths
    for the EXc's and 690's...

    Not that I know that because I have been trying
    to find a longer travel fork for my 690...

    Err.... very.... much.... :rofl

    Will these new kits will fit the 2012-2013 690's ?
    #16
  17. LukasM

    LukasM Long timer

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    That's what KTMMitch has been saying, they are building new custom parts to extend the 2012/13 690 forks up to 300mm.

    On the older forks it's easy because you can just swap in EXC internals.
    #17
  18. NovaMoto

    NovaMoto Been here awhile

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    Re-springing both ends of this bike is near $400 before you even consider taming down the valving.

    If you managed to buy new springs all around & pay someone to re-valve the front & install the works for 500$ OTD you got yourself one great deal!


    #18
  19. AccelRus MaxiMus

    AccelRus MaxiMus Been here awhile

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    Good info - must mean a lot of overlap in the
    690's - likely cross-compatibility saves on parts
    and development as well

    Nice to work with guys who know the details !!

    Looking forward to trying these out - and glad
    they will work with the older and newer 690's

    Great work !! :clap :clap
    #19
  20. gen

    gen Been here awhile

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    Just received my new upgraded Superplush springs and rear shock collar.
    I didn't take photos of the fork springs.

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
    #20