Suspension setup

Discussion in 'Technical Forum' started by LegitxORxQuit, Mar 12, 2010.

  1. LegitxORxQuit

    LegitxORxQuit Member

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    Just wondering if there is anywhere in edmonton that i can get my suspension professionally setup for my weight.
     
  2. Arctic Donkey

    Arctic Donkey Active Member

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    With the help of a friend or two you can do a lot by yourself. The "right" spring weight is dependant on what you think the "right" amount of sag is. Opinions vary, but if you are on any modern sportbike I would start with 35mm of sag in the front and 30mm in the rear as a begining point. If you can get those numbers without having a crazy amount of preload (>15mm of preload on shock = too much). This info is for the track, I have no idea what needs to be done on a streetbike. What bike are you wanting to setup?

    Steve
     
  3. racer51

    racer51 Active Member

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    Rick Newcombe "Duke Nukem"
    Bottom out pre-load adjusters

    Is it true that if you bottom out the tension adjusters on your fork spring pre-load, they become non-functional?
     
  4. Arctic Donkey

    Arctic Donkey Active Member

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    Rick, are you talking about the preload adjuster on the top of your forks? If yes, they don't become non-functional, they just only go in so far. If they are in all the way and you need more preload you need to open up the forks and add longer spacers. To start with you could measure the length of the external preload adjuster (from all in to all out) and then cut a spacer that is that much longer than the current spacer that is in the forks.

    If you having to add a lot of preload to get the sag you want it could be a sign that you need heavier springs. If you don't have much sag with only the weight of the bike but the correct rider sag (rider on bike)then the springs are too soft. If you have excessive bike sag and the correct rider sag the springs are too stiff.
     
    Last edited: Mar 12, 2010
  5. LegitxORxQuit

    LegitxORxQuit Member

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    Yea I know I can do it with some of my buddy's but I have no idea what these numbers mean so I want to leave it to professionals
     
  6. LegitxORxQuit

    LegitxORxQuit Member

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    O ya and its for a Honda RS 125
     
  7. Arctic Donkey

    Arctic Donkey Active Member

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    Well that clearly is a track only bike and a bit of a different animal. Forget about what I said on the sag numbers. I don't really know what the best starting point would be on a RS125 but on a lightweight bike with that amount of power you would run less sag than on say a 600. I'll have to look around a bit and get back to you.
     
  8. Arctic Donkey

    Arctic Donkey Active Member

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    OK, from what I could find a good starting point for the front is ~20mm of bike sag and 30-35mm of sag with rider. The rear is a little different than on most bikes because you don't want it to squat very much at all. So basically zero bike sag and 20-25mm of sag with rider. Hopefully some of the other racers that are actually on 125s will chime in and correct me :)
     
  9. racer51

    racer51 Active Member

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    Rick Newcombe "Duke Nukem"
    Ask the Donkey

    As Shrek so lovingly said..."Go ask the Don-kay..."
     
  10. LegitxORxQuit

    LegitxORxQuit Member

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    Ya the thing is I have non idea how to set up the preload and stuff like that and I have no idea what these numbers mean.
     
  11. Ducbert

    Ducbert Active Member

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  12. LegitxORxQuit

    LegitxORxQuit Member

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    Thanks thats really helpful
     

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