BMW G650XChallenge FRONT SUSPENSION

Discussion in 'Thumpers' started by lkongo, Oct 21, 2007.

  1. oggi

    oggi Adventurer

    Joined:
    Mar 5, 2007
    Oddometer:
    69
    Location:
    nyc
    does anyone know if the bearing cups on the x-chal are the same diameter as on the f650?
    #61
  2. Max Kool

    Max Kool Xtankteam™

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    Jan 19, 2004
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    3,242
    Location:
    Los Angeles
    I've been told there's even the same as those from a K100 or a BMW airhead.
    #62
  3. DownhillChief

    DownhillChief bOOb

    Joined:
    Mar 1, 2009
    Oddometer:
    46
    Location:
    Belgium
    I don't like the screws to adjust the forks. Anyone knows good and easy to fit 'knobs'? Would be so much easier...
    #63
  4. bmw_elvis

    bmw_elvis Adventurer

    Joined:
    May 15, 2009
    Oddometer:
    12
    i m also interested in this option...has anyone done this?:freaky
    #64
  5. R80 STrider

    R80 STrider Adventurer

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    Mar 21, 2007
    Oddometer:
    43
    Everything comes at a price! I believe Wunderlich sell knobs for this very purpose. :rofl
    #65
  6. Rordog

    Rordog Been here awhile

    Joined:
    Feb 3, 2007
    Oddometer:
    154
    Location:
    Waterloo, Il.
    Just wanting to know if there are any tricks about taking the forks apart to put new springs and oil in. Do I take the caps off, then drain the oil, and install new springs and oil. I've looked all over and cann't find any information. Anything would help.[​IMG]
    #66
  7. mattconeill

    mattconeill non-n00b

    Joined:
    Aug 8, 2008
    Oddometer:
    50
    Location:
    New Canaan, CT

    Especially if it is easy-ish... Are people using the aftermarket Touratech springs? Does Ohlins make springs for these shocks?

    Thanks in advance!
    #67
  8. "A"

    "A" numbum

    Joined:
    Aug 20, 2008
    Oddometer:
    382
    Location:
    Albany Western Australia
    I put in a set of Wilbers. They provided instructions that gives the info needed. It required removal of the forks from the bike, taking caps off etc. Correct procedure to put in the right amount of oil and purge out air is explained. Hope this helps.
    #68
  9. Cruz

    Cruz Lost but laughing.

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    Oddometer:
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    Location:
    Northside Brisbane, Qld Australia
    Hyperpro do springs for the XC as well.
    #69
  10. DownhillChief

    DownhillChief bOOb

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    Mar 1, 2009
    Oddometer:
    46
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    Belgium
    Is there some kind of report of all these aftermarket springs? I really don't like the stock ones but have no idea which springs to get...
    #70
  11. Cruz

    Cruz Lost but laughing.

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    I have read a few reports and received info from owners who have changed springs on the XC. Most gave the Hyperpro a huge + for improvement while some other brands did not make that much difference.

    Other than oil and springs there is not much else that can be done to the standard fork. In Oz Hyperpro front springs are approx $250 and the rear shock is $1650 (compared to the Ohlins for $760 delivered).

    Might just do the front springs and oil first and see what the difference is and then think about the Ohlins.
    #71
  12. Pine Sol

    Pine Sol Been here awhile

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    Jan 6, 2004
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    499
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    in transit, without a destination...
    #72
  13. plumley51

    plumley51 n00b

    Joined:
    Dec 12, 2009
    Oddometer:
    1
    I understand that many of you wanted to alter your front suspension. I would like to pursue altering the frt height (I'm 6' 1 1/2") and as I ride it feels like the bike is angled rear-to-frt. There is aprox 1in 4/64 of tube above the clamp. So what happens to the handling if I raise the clamp. Nothing in the owners manual about the tube height. I'm a newbe oh yea I weigh 225lbs. I see some have changed using risers, I have ABS and am not sure of my cable length allowance.
    #73
  14. evoluzione

    evoluzione Been here awhile

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    Oct 5, 2005
    Oddometer:
    333
    Location:
    murrieta, california
    i've been playing with the front fork valving on my xc and have found there is a lot of potential with these forks (yes, i know it supposedly can't be done but by machining my own parts i can now make changes to valving/shims).

    i've found the compression side really does nothing until you get through most of the travel. the rebound side has the control of both rebound & compression but the adjustment screw only affects rebound. by modifying the compression side i've found a lot more control throughout the range as well as the ability to have meaningful adjustments.

    as i continue to test out the settings i will post my findings.
    #74
  15. Cruz

    Cruz Lost but laughing.

    Joined:
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    6,420
    Location:
    Northside Brisbane, Qld Australia
    and we wait with baited breath.........:1drink

    and orders and money.
    #75
  16. evoluzione

    evoluzione Been here awhile

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    Oct 5, 2005
    Oddometer:
    333
    Location:
    murrieta, california
    here's a teaser shot showing some of what i've been working on:

    [​IMG]
    #76
  17. Redbull Addict

    Redbull Addict I need another one...

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    Jun 24, 2006
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    1,262
    Location:
    San Jose / Truckee
    Damn it man...that's 2 major upgrades you've teased us with. Are you going to sell this stuff???
    #77
  18. vince taylor

    vince taylor Adventurer

    Joined:
    Aug 18, 2004
    Oddometer:
    91
    Maybe if all the X owners chime in so evoluzione has some idea how many of us would be interested there might be enough of us to make it worth while for him to make a run of new valves for our forks ?
    #78
  19. evoluzione

    evoluzione Been here awhile

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    murrieta, california
    i hope you folks understand that we do a lot of development work that never turns into sellable products for one reason or another. in the case of the front suspension valving, there does not seem to be a lot of customer interest. also, there is the issue that we would need to do the initial modification to the cartridge (requires us to precisely machine the cartridge - if we just sold the valves and let the customer do the final machining and they mess it up, then they would need to buy new cartridges). once we do the modification, the customer will be able to change/adjust shims by themselves.

    the bottom line is that if we had enough interest to machine 25 sets then it might make sense to us. i would guess that the cost would be $200-$300 a set including us doing the intial modifications to the cartridge.
    #79
  20. Redbull Addict

    Redbull Addict I need another one...

    Joined:
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    Oddometer:
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    Location:
    San Jose / Truckee
    I'm IN for that amount.
    #80