Raising/Lowering forks 09 250R
  • Halen
    Posts: 362
    Joined: Sat May 13, 2006 4:32 pm

    Raising/Lowering forks 09 250R

    by Halen » Sat Nov 15, 2014 6:07 am

    Hey guys.. Looking for some feedback on raising/lowering the forks.
    I just finished a 3 day riding adventure with a few guys riding different machines (Kawi, KTM, and a Yami)
    I noticed all the forks (other than my Honda) set aprox. 5 mm higher in the triple clamp then mine.
    All parties said these settings were stock.
    Does Honda set their forks lower in the tree for a reason?
    If I raise the forks.. How much will this change the handling of my bike?
    FYI.. I had the suspension professionally lowered by RMR this spring.
    He set it up about 2" lower will a full seal/spring job. I find I'm 'plowing' into the comers a bit more then I'd like too... However this is a new bike for me. Came off a 2005 CRF 250X.

    Cheers
    Van
    09 CRF 250R
    RMR lowered suspension
    Heavily armoured for the bush
    50 tooth rear
    soft gel seat
  • User avatar
    JimDirt
    Posts: 2617
    Joined: Sat Nov 25, 2006 6:31 pm

    by JimDirt » Sat Nov 15, 2014 8:13 am

    Did the guy lower the front as well as the rear ?/

    The purpose for raising/lowering is to un-weight/weight and/or remove/add turning and braking in corners , as well as alter high speed stability (head shake) , i did not lower my 450X internally (though i did personally re-valve both my bikes), i did the lowering with a Kouba Link , and moved the forks UP in the clamps to 6mm , my 02 450R is recommended to be set that way stock and is where i have it as well , so its a common practice to alter steering and "feel" of the ride

    The reason Honda has them higher is to give the bike a more neutral feel , though most people tend to alter this setting because most feel Honda's do not have enough steering in corners and tend to push , the exception is the 09+ 450R that everyone complained about a Stinkbug feel (the rear too high) , but that was due to too soft fork springs

    So basically , if you set it at 6mm for example (where i run both my bikes) , you will get improved steering into corners and still retain high speed stability , if you notice you have a lot of front end push in corners , or the front end just deflects a lot off rocks/roots , etc , then raising the forks will take some of that away, and make the front feel more planted

    If the bike is knifing (turning too sharp making you almost crash because the front end turns so sharp you almost get thrown off the bike )in corners (dont confuse this with front end push/wash outs) then lowering the forks in the clamps (making them flush with the top clamp) will help

    The key is to balance the bike front to rear , giving sharp enough turning to remove push , but not to make the bike knife or feel like your going downhill while on level ground or taking away traction from the rear by putting too much weight forward , also make sure your sag is set correctly before worrying about the front , if the sag is not right , the forks wont be right no matter what you do , its a balance between front and rear

    I would suggest trying it like it is and ride for a bit , then raise it 4mm and ride it a bit , then change it to 6mm , you should feel the difference , try riding for 5-10 minutes with each setting at the same location to get a overall feel for each position , then decide what you prefer , there is no right or wrong in this and you can go anywhere in between , , its all about how the bike reacts and how you like or dislike the reaction

    IMPORTANT NOTE:
    When changing the clamp position , do this with the bike on the stand AND (very important) with the front wheel OFF , when you set 1 fork where you want it (say 6mm) then put the other fork at the same measurement but only slightly snug that side , now stick your axle thru and see if it slides all the way in without force of any kind (spray WD-40 on the axle and wipe it down to assure its free from dirt ,etc that can make it stick)

    If the axle hits and you have to slightly raise or lower it to get it in all the way , then move the loose fork up/down to allow the axle to slide in smoothly and freely ,(you may only need to move it 1/16th of a inch or less to make a difference) then torque everything down , re-check the axle is smooth in and out , then replace your wheel , this is a must for proper suspension movement , most people overlook this step and think there is a issue with the suspension , and it was only missing this step when making physical changes to the fork tubes themselves within the clamps

    Sorry for the book , but hopefully that helped explain it thoroughly enough to give you a place to start with your settings ! ;)
    Last edited by JimDirt on Sat Nov 15, 2014 11:45 am, edited 1 time in total.
    02 CRF450R
    06 CRF450X
  • Back2-2
    Posts: 562
    Joined: Tue Jan 04, 2011 3:31 pm

    by Back2-2 » Sat Nov 15, 2014 10:01 am

    Excellent front end set-up write up Jim.

    Only one thing I would like to add is - Use a Torque wrench on all fasteners. Use the "cold creeper" method. Which is to torque fasteners [ use criss-cross pattern ] and allow 5 minutes for soak and re-torque.

    Hope that helps. 8)
    Neil
    Scottsdale, AZ
    "It's all about motorbikes - Always has been, always will be"
  • User avatar
    PAPADOC
    Posts: 1
    Joined: Thu Sep 21, 2017 1:37 pm

    Re: Raising/Lowering forks 09 250R

    by PAPADOC » Thu Oct 12, 2017 7:15 am

    Great information...have a 2014 CRF450x and I installed a Kouba Link CRF4. I have raised my bars so I have a lot of room. Should I raise the forks the same amount that the Kouba lowered the bike, 1.75" or would that cause the wheel to hit the fender? Thanks for any information and very much for the information about removing the front wheel. I would like to lower it max amount. Tall torso short legs and bad knees means I need to be closer to terra firma.
    2014 CRF450x
  • Back2-2
    Posts: 562
    Joined: Tue Jan 04, 2011 3:31 pm

    Re: Raising/Lowering forks 09 250R

    by Back2-2 » Thu Oct 12, 2017 11:21 am

    I know you can raise the tubes 1" to 1 1/4" with no issues. I cannot answer for 1 3/4". Yes, ideally you would like to balance the bike back to neutral. I can tell you that my bike lost some of the heavy sand stability by not being able to get the front to be the same lowered point as the rear. But, it also increased the quickness in steering which was good thing.
    If you have the room to lower to match the rear - try it. Unless you are really hitting the trails hard it's not common to use the full travel on a "X" model.
    Neil
    Scottsdale, AZ
    "It's all about motorbikes - Always has been, always will be"

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