BMW G650XChallenge FRONT SUSPENSION

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

  1. Colebatch

    Colebatch "Moto Porn"ographer

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    Just a thought, for people before they spend too much on original forks:

    My originals that I used last year are (i think) slightly bent. Getting the sliders back into after taking them out for a service was pretty tough. Can check to confirm it later.

    Before I started last years ride, Simon Pavey who raced one in the Dakar in 08 had briefed me that the stock XC stanchions (tubes) were made of a soft metal on the XC. After bending 3 pairs, he swapped his stanchions out for same sized but better metal units from a HP2.

    Only problem is, since they dont make HP2s anymore, the HP2 stanchions are rare as hens teeth and super expensive.

    Just something else to bear in mind.

    Maybe the shiver stanchions will fit? Are they the same length?
  2. Cruz

    Cruz Lost but laughing.

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    The stanchions are the same length on mine just the lower clamp area is slightly larger but could be turned down to fit properly.

    New Marz 45 sliders are about a cm longer than OEM.

    Will be keeping my bits for spares.
  3. FinnDuro

    FinnDuro Winter wonderlanding

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    Note to all: when / if you need to machine down the lower triple clamp area on the Marzocchi Shiver tubes to make them fit into original Xchallenge triples, be careful not to overtighten them upon final installation.

    10Nm is adequate torque for the lower triple clamp bolts. More than that, and you risk squeezing the machined tubes too much, resulting in stiction and general shitty behaviour. On the top triple clamp area, 25Nm should suffice, and it's not that critical.



    (and I have a set of RXV Shivers coming in, too - building a set of forks for my friend's X.)
  4. magno

    magno Adventurer

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    Hi all

    Anyone out there know if the 45mm Marzocchi Shivers from a 2007 Gas Gas EC250 will fit the X Challenge?

    I was hoping to keep the original sliders and fit the stanchions from the new forks.

    Any help appreciated.
  5. FinnDuro

    FinnDuro Winter wonderlanding

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    eBay UK, huh? :)
    For what it's worth, i.e. my opinion: I think they should be ok.
  6. Colebatch

    Colebatch "Moto Porn"ographer

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    I recently picked up a set of the Black Marzocchi 45mm Factory Series forks ... http://www.marzocchi.co.uk/moto/45legsend.html

    [​IMG]

    They dont make them anymore, but I found a pair on Ebay.

    I got them because my old riding buddy Terry (BAM Road Terry) bought a pair for his X-Country and said they fitted straight in. I had thought about using these a year ago, but dismissed it because I thought they were the wrong size for the stock triple clamps ... but I was wrong.!

    Like other compatible Shiver transplants, this is probably the easiest high quality fork transplant for the X-Country / X-Challenge. They fit right in. All that needs to be done is to spin off the axle clamps from the stock forks, drill access for the compression adjustment and put them on the black anodised sliders on the Marzocchis.

    Here is Terry's bike yesterday in the Hyperpro workshop in Alphen, Holland. Bas was respringing and revalving, and changing the weight of oil in the forks. The bike sits as high as an X-Challenge now

    [​IMG]
  7. Cruz

    Cruz Lost but laughing.

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    Will be good to read what he thinks of them.

    Still waiting for mine to be done the same way.
  8. Colebatch

    Colebatch "Moto Porn"ographer

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    I will also do a set for my XChallenge ... so will be able to compare directly with the WP forks I have in there now.

    Will do a full write up when I begin
  9. motobone

    motobone Free for all!

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    I went for a litle ride last week, had a couple of offs, just like any other day. However, on my ride yesterday, I noticed my newly replaced fork seal was leaking like crazy. Upon further inspection, I noticed this--

    [​IMG]

    I've been reading the posts and it looks like were left out for replacements without some fabrication and a fist full of cash, which I'm a little short on.

    I'm hopefully going to be able to still use these forks for this weekend, but I'm not sure.

    So, does anyone have a front fork they want to get rid of? I'm trying to avoid the $700 to purchase a new upper fork.

    I'm also open to options for an upgraded front end now.
  10. FinnDuro

    FinnDuro Winter wonderlanding

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    Umm, what actually is the "this" in your photo? Damaged dust seal, no?
    Or have you opened the fork, and there's something terribly wrong inside there... that a new dust seal, oil seal and bushing replacement will not fix?
  11. pampaX

    pampaX Been here awhile

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    Does anybody know if this ones would fit?

    "...
    Marzocchi Shiver 45mm forks Beta

    This is a set of take off front forks from my 2008 Beta 525

    :
    :
    "
  12. motobone

    motobone Free for all!

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    You're right. It's already been fixed. I was just a little nervous since I have a ride planned this weekend, so I was looking to overnight parts if necessary.

    If I didn't have the ride planned I would, I would start really working on the front end and use this as an excuse.

  13. sideway5

    sideway5 Mudmuppet

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    I've tried searching but couldn't find any reference to the diameter of the upper and lower fork clamps? Anyone got the numbers at hand? I don't have my bike at hand so can't take the measurement myself atm.
  14. FinnDuro

    FinnDuro Winter wonderlanding

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    The OEM fork clamp, and respective fork tube, diameters are: Upper 54mm, Lower 57mm.


    And just for information, when considering forks conversions based on Marzocchi Shiver 45mm units off of other models:
    Aprilia RXV forks: upper 54mm, lower 57mm
    Husqvarna TE forks: upper 54mm, lower 58mm.
  15. sideway5

    sideway5 Mudmuppet

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    Great info, many thanks! :clap
  16. magno

    magno Adventurer

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    [​IMG]

    How many litres is that fuel tank?
  17. Colebatch

    Colebatch "Moto Porn"ographer

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    Think Terry said it was about 7.5 litres
  18. Niedz

    Niedz Been here awhile

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    is that tank being sold, or is it a one-off?
  19. Colebatch

    Colebatch "Moto Porn"ographer

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    one off
  20. Colebatch

    Colebatch "Moto Porn"ographer

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    And to confuse it more ...

    I have noticed the Black Factory Series 45mm Marzocchis are sometimes 57mm at the bottom clamp and sometimes the 58mm (or more like 58.4mm I think) size.

    Go figure