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Thread: Fork chatter

  1. #1

    Default Fork chatter

    I've got an 08 530EXC that I'm trying to get the forks to work in a series of small fast bumps going into a corner. They were done for the original owner by Trail Tricks, I have put in the springs for my weight and changed the oil. They "chatter" on me, not the sound but they tend to just get into the section, not soaking it up, pounding my wrists. They work OK in slow corners and general whoops, I just notice it on gravel roads with small bumps going into a corner. Tried more and less rebound, didn't seem to change it much, less a little. Any suggestions, less or more oil?
    DK

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  3. #2
    KTMTalk Member ktmaholic's Avatar
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    Default Re: Fork chatter

    Spring rate and rider weight?

  4. #3
    Lifetime Team KTMTalk Layton's Avatar
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    Default Re: Fork chatter

    Maybe the brand of tire or tire pressure.

    Are you sitting to the back of the bike?

  5. #4

    Default Re: Fork chatter

    Quote Originally Posted by ktmaholic View Post
    Spring rate and rider weight?
    Standard/Stock and I'm 180 without gear.
    DK

  6. #5
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    Default Re: Fork chatter

    For me it was a combination of to stiff springs and not enough rebound damping, A lower oil level should help a little, did you check the pre load on the springs should be around 5mm if too much it could cause it, what wight oil 4wt is stock, last how heavy was the springs you removed the valving might be set up stiff, there are lots of things that could case it.

  7. #6
    KTMTalk Member ktmaholic's Avatar
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    Default Re: Fork chatter

    It sounds like it could actually need more compression damping. Big 4 stroke needs shims. If you flip the forks you can have the base valve out quickly and inspect shim stacks. Wont tell you if mid valve is correct but will give you a general clue which direction Trail Trick was going.

  8. #7
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    Default Re: Fork chatter

    Google Ktmlew shim stacks the ones he posted seem to get good reviews for off road riders and use it as a compression to yours and then go from there. And as the previous poster sad flip the forks and remove one of the base valves and see what you got it should give you a idea how stiff they were set up and is a quick and easy way to get your feet wet with fork valving if there are more then three face shims Id start there or you could post the stack for help.

  9. #8

    Default Re: Fork chatter

    Thanks all, I've got some work to do.
    DK

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