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Thread: 7K machine midvalves

  1. #51

    Default Re: 7K machine midvalves

    OK, Let's try those images again - from my previous post.











    Kenny Schipper
    7kmachine.com

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  3. #52

    Default Re: 7K machine midvalves

    Quote Originally Posted by runninn View Post
    I sent my forks off to 7K for the revalve. Look forward to reporting back the difference!
    * I have a 10 XCW waiting for a similar revalve if this works as well as expected....
    Cant wait to hear your ride report!

  4. #53

    Default Re: 7K machine midvalves

    If you are using Restackor to develop absolute dampening numbers, you might want to rethink the h.deck figure on the compression side of the WP MV. Restackor defaults to the theory that the check plate on the back side of a piston is a round shim. The area of the port intake is determined by multiplying h.deck by w.port and this may be a restriction to flow.

    The theory/calculation works just as it should IF you have a round check plate on the piston (such as the WP BV). In the case of WPs MV, the check plate for compression side of the piston is the rebound stack. WP uses a triangular delta shim for the face shim on the rebound specifically to reduce the MV intake port restriction that a round shim would induce.

    I normally use 10 for the h.deck figure just to fool Restackor that there is no intake port restriction for the WP MV. If you do this you will get a better result of absolute figures. It will also give you a better comparison if you are looking at two different pistons where one is using a delta on the REB while there other piston is using a round shim.

    You have some nice looking pistons, what kind of float are you using on a CC set up?
    Dave

  5. #54

    Default Re: 7K machine midvalves

    Satisfied 7KM customer here. Made it SO much nicer to pound through rocks all day on my 500. The bike sees everything from slow(ish) nasty rocky singletrack to higher speed dual sport (but still often rocky as hell) and handles it all marvelously. Makes the big bike so much less of a chore to ride hard all day long. I ride these along side KYBs on my 250 and, like 2strokenut mentions, the 'feel' is different, but seems to be every bit as capable. I haven't found anything I can't hit with confidence on either bike and one is set for A level enduro/HS racing and the other for long haul dual (cruel) sporting. Slight price differential between the setups as well....
    '17 250 XC
    '15 500 XCW

  6. #55
    KTMTalk Member dwb79's Avatar
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    Default Re: 7K machine midvalves

    Quote Originally Posted by Bikedude987 View Post
    The OEM WP stacks cavitate almost immediately, as shown below. This is with full stacks as measured from my personal forks. These are OC forks...(snipped)
    Quote Originally Posted by Bikedude987 View Post
    OK, Let's try those images again - from my previous post.












    I've never seen OEM WP stacks like that. Can you please clarify what you have here?

  7. #56

    Default Re: 7K machine midvalves

    Quote Originally Posted by DMG300 View Post
    If you are using Restackor to develop absolute dampening numbers, you might want to rethink the h.deck figure on the compression side of the WP MV. Restackor defaults to the theory that the check plate on the back side of a piston is a round shim. The area of the port intake is determined by multiplying h.deck by w.port and this may be a restriction to flow.

    The theory/calculation works just as it should IF you have a round check plate on the piston (such as the WP BV). In the case of WPs MV, the check plate for compression side of the piston is the rebound stack. WP uses a triangular delta shim for the face shim on the rebound specifically to reduce the MV intake port restriction that a round shim would induce.

    I normally use 10 for the h.deck figure just to fool Restackor that there is no intake port restriction for the WP MV. If you do this you will get a better result of absolute figures. It will also give you a better comparison if you are looking at two different pistons where one is using a delta on the REB while there other piston is using a round shim.

    You have some nice looking pistons, what kind of float are you using on a CC set up?
    Dave
    I did look into the differential restriction between the assumed round shims and the delta shim and determined that there wasn't enough difference to warrant a 'trick' in the program.

    I'll look into it again tonight per your recommendation and see if it makes any significant change.

    Float is set depending on individual customer needs. Off the top of my head ~.6-.8mm float, but we're literally changing everything else, so the large float is only a small part of the picture.
    Kenny Schipper
    7kmachine.com

  8. #57

    Default Re: 7K machine midvalves

    Quote Originally Posted by dwb79 View Post
    I've never seen OEM WP stacks like that. Can you please clarify what you have here?
    These were pulled from a 2010 530 xc-w. The stacks I pulled from my 2014 450 xc-w were very similar.
    Kenny Schipper
    7kmachine.com

  9. #58
    KTMTalk Member dwb79's Avatar
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    Default Re: 7K machine midvalves

    Quote Originally Posted by Bikedude987 View Post
    These were pulled from a 2010 530 xc-w.
    OEM 530 Settings

    BV

    24 x 0.10 (7)
    23 x 0.10
    22 x 0.10
    21 x 0.10
    20 x 0.10
    19 x 0.10
    18 x 0.10
    17 x 0.10
    16 x 0.10
    14 x 0.10
    12 x 0.10
    9.5 x 0.30
    16 x 0.25

    MV
    18 x 0.10
    20 x 0.10 (3)
    18 x 0.10
    16 x 0.10
    10 x 0.20
    Float = 0.60mm

    REB

    20d x 0.10 (3)
    12 x 0.10
    16 x 0.10
    14 x 0.10
    13 x 0.10
    12 x 0.10
    10 x 0.30
    14 x 0.25


    Quote Originally Posted by Bikedude987 View Post
    The stacks I pulled from my 2014 450 xc-w were very similar.
    OEM 450 Settings

    BV

    24 x 0.10 (6)
    22 x 0.10
    20 x 0.10
    18 x 0.10
    16 x 0.10
    14 x 0.10
    12 x 0.10
    9.5 x 0.30
    16 x 0.25

    MV
    18 x 0.10
    20 x 0.10 (3)
    18 x 0.10
    16 x 0.10
    12 x 0.10
    16 x 0.15
    11 x 0.10
    Float = 0.55mm

    REB
    20d x 0.10 (3)
    12 x 0.10
    16 x 0.10
    14 x 0.10
    13 x 0.10
    12 x 0.10
    10 x 0.30
    14 x 0.25



    All three of the stacks you have entered into ReStackor are quite different to these two OEM stacks and every other OEM KTM stack.

  10. #59

    Default Re: 7K machine midvalves

    Iím interested as well.. but thinking of any unbalance between front and the rear..
    When you said younger looking into it / working on it ( the rear shock ) .... Is this just a shim shuffle, or looking at replacing one of the pistons as well?

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