GSX-R 600 K4 Front forks - problems

Discussion in 'Motorbike Technical Discussion' started by Gixxerman, Aug 8, 2007.

  1. Gixxerman

    Gixxerman Guest

    Hi all,

    I have been changing the oil to the forks of my gsx-r 600 k4, after re-
    install it again in place, went to try it and its a big mess,
    initially even with the standard settings the fork looks too stiff,
    but under braking the front compress fully to the end of it, try to
    give more preload in the spring, and it's the same.... other thing it
    makes is, in higher speeds when hit the front lever, i feel a big
    I heard this can be caused by air inside the cartridge...

    Any ideas?????


    Gixxerman, Aug 8, 2007
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  2. Gixxerman

    Dave Emerson Guest

    How much oil did you use?

    Did you measure volume or oil or depth to level, if latter to/from what

    What weight of oil did you use?
    Dave Emerson, Aug 10, 2007
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  3. Gixxerman

    Gixxerman Guest

    In the beginning i put a little bit under the recommended quantitty,
    but now i have refill it, and have the exact amount especify in the
    service manual.

    After some tests, the front is now working ok, but is still juddering
    when i brake harder under highest speeds, it guet's better when i
    close the rebound, but then it becames to stiff.

    Gixxerman, Aug 13, 2007
  4. Gixxerman

    Gixxerman Guest

    Forgot to tell,

    I'm using Motorex Oil 5w as specified in the service manual
    479 ml in each side of the fork...
    Gixxerman, Aug 13, 2007
  5. Gixxerman

    Gixxerman Guest

    I haven't been to the site, and my weight is 83 kg's

    before i change the oil, the forks were working ok with the std
    settings, after i change the oil they aren´t :) ,

    Probably to reduce the compression damping i have to add a little bit
    more oil, because the front is still diving a lot, after that will try
    it again to see how it feels, as soon the front is ok in matters of
    compression, i will start to find the perfect rebound setting.

    Gixxerman, Aug 13, 2007
  6. Gixxerman

    Gixxerman Guest


    Thanks for the info

    i will make that, then after try it i will write here my impressions.

    Gixxerman, Aug 14, 2007
  7. Gixxerman

    Gixxerman Guest

    So here i'am, to make the latest update.

    I've changed the brake discs and pads, but still have the vibration
    under braking, the funny thing is if i go at 150 km/h and brake hard,
    the bike goes very smooth, as soon as a get to the 80km/h the front
    starts to vibe, after the speed goes under 70km/h the bike goes smooth

    Next step is tho try a different wheel to see if is bearings problems,
    or tire.

    Best Regards
    Gixxerman, Sep 25, 2007
  8. Gixxerman

    ~ Guest

    Have you re-torqued the steering head bearings recently?
    ~, Sep 25, 2007
  9. Gixxerman

    Gixxerman Guest

    nope, and that is also a good idea to do that
    Gixxerman, Sep 25, 2007
  10. Gixxerman

    Gixxerman Guest

    After re-torqued the steering head bearings, and change the front
    wheel bearing, the bike keeps doing the same vibration. a go now try
    with a different wheel to check, if it's not the wheel.

    Gixxerman, Oct 16, 2007
  11. Gixxerman

    Gixxerman Guest

    I All, it's me again, changing the front wheel, produce no effect in
    the vibration of the front, the vibe is still there when braking,
    could it be the suspension.

    Gixxerman, Oct 17, 2007
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