Fork help
  • User avatar
    316hepster
    Posts: 18
    Joined: Fri Jul 29, 2005 11:38 am

    Fork help

    by 316hepster » Tue Nov 03, 2015 4:46 pm

    Just replaced seals (and whole inner chamber piston assembly on one). Now the forks do this...

    Image

    Image

    My 450 looks like this...

    Image

    The 250 forks stay like that when being ridden as well. I have about 340cc of fork oil in each tube. I bought it used so I don't know what springs are in it. I do not recall it sagging like that before I replaced the seals in both and bolt assembly in the one.

    Any ideas???
  • User avatar
    JimDirt
    Posts: 3367
    Joined: Sat Nov 25, 2006 6:31 pm

    by JimDirt » Tue Nov 03, 2015 10:29 pm

    I tried Firefox , Internet Explorer and Google Chrome , and i can not see the images your trying to post , i think the links are not correct
    02 CRF450R
    06 CRF450X
    Image
    Weiser , Idaho
  • User avatar
    316hepster
    Posts: 18
    Joined: Fri Jul 29, 2005 11:38 am

    by 316hepster » Wed Nov 04, 2015 3:55 am

    I can see them fine... Check out my post on thumpertalk and see if that makes a difference

    http://www.thumpertalk.com/topic/115982 ... ry12727684[/img]
  • mossman77
    Posts: 316
    Joined: Tue Jan 13, 2015 9:28 am

    by mossman77 » Wed Nov 04, 2015 6:07 am

    I can see them as well. Perhaps you didn't bleed the inner cartridge sufficiently. Did the damper rods fully extend after you compressed them?
    2007 CRF250X
    2004 CRF230F (sold)
  • User avatar
    316hepster
    Posts: 18
    Joined: Fri Jul 29, 2005 11:38 am

    by 316hepster » Wed Nov 04, 2015 6:51 am

    I'm pretty sure I bled them properly... The rods did fully extend after compressing. I may have put the fork spring cone upside down but I really think I installed it properly.
  • mossman77
    Posts: 316
    Joined: Tue Jan 13, 2015 9:28 am

    by mossman77 » Wed Nov 04, 2015 6:53 am

    I believe if the cone were put in upside down, that you'd have more preload not less. Come to think of it, I'm not sure that cone is even removable, or at least not supposed to be. I don't see it as a separate piece in the parts fiche. Did yours come off? If so, that would cause sag because the springs would be perched lower than they should be.
    2007 CRF250X
    2004 CRF230F (sold)
  • User avatar
    JimDirt
    Posts: 3367
    Joined: Sat Nov 25, 2006 6:31 pm

    by JimDirt » Wed Nov 04, 2015 9:26 am

    Weird , i can see images in other posts in this forum fine , i even rebooted my PC , the only way i could see the image was to right click on the little square i see in the post where the image "should" be and it takes me to your image account(tinypic) , anyway , i see its compressed , so as mossman77 said , it would most likely have to do with bleeding the inner cartridge , or something is "stuck" causing the springs not to extend fully , maybe installing the longer brake cover bolts into the fork guard locations , denting the tube and jamming the spring (the spring would be then stuck in the fork tube if this is the case)

    I am leaning towards a bleeding issue , and the cartridge is not being allowed to extend fully

    When you very first assembled the forks (before putting them on the bike) did they fully extend ,not while just holding the cartridge in your hand while bleeding , but after assembly and working the fork up and down before installing on the bike ??

    Sometimes if not bled correctly or if the Free Piston Seal is bad it will work fine a few times , but the more times its compressed it will suck in farther each time ,blowing out the fluid into the outer chamber which would raise the outer chamber fluid amount , but more importantly cause a suction in the cartridge and pull the forks down in a extreme case

    Either way the forks need to come back apart and you need to see what is happening , if it was fine before , then it has to be something you overlooked , or did not assemble correctly
    02 CRF450R
    06 CRF450X
    Image
    Weiser , Idaho

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