Is this normal???

4 replies to this topic
  • TeamPrecisionIT

Posted September 12, 2007 - 02:13 PM


So I went ahead and redid my fork seals, relubed all the linkage bearings and basically performed a complete service on my YZ450. Because I did this, I wanted to get reacquainted with the suspension's adjustments (with the revived greasing, lose of stiction and such) so I did what I normally do with any bike that has adjustable suspension which is (and in this order):

2 laps on each set up:

1. All settings at minimum (0)
2. Front compression to full hard, everything else at 0
3. Front compression back to 0, front rebound to full hard, everything else at 0
4. Front rebound back to 0, Rear LS compression to full hard, everything else at 0
5. Rear LS compression back to 0, Rear HS compression to full hard, everything else at 0
6. Rear HS compression back to 0, Rear rebound to full hard, everything else at 0
7-18 - I do it again but with everything at midway except one thing at first will be at maximum and then for the second set (13-18) everything to minimum.

What this procedure allows me to understand is how things feel throughout the suspension adjustment range. I guess now that I have typed all of this, it can be used by others to experiment with, but anyway, my real question is this. I have completely stock suspension (springs, valving, etc.) minus my new fork fluid, which I don't think in this instance matters, but when I got to my rear rebound setting experiments, basically my bike was stuck in a lowered position. And I don't mean a slow rebound, I mean it didn't move until I forced it back up by lifting on the rear fender. Does the YZ's stock shock have that kind of power in the adjustment range, or do I need to look into a rebuild? I am posting this on the suspension forum as well, but I wanted to ask my Yamaha brethren about this, too.


  • grayracer513

Posted September 12, 2007 - 10:01 PM


If the shock on your '03 has never had an oil change, it could be time.

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  • Ga426owner

Posted September 13, 2007 - 05:05 AM


Agreed until shock is serviced you are not getting ideal setting/measurements = Fork and Shock should both be serviced at the same time

Also, what is your weight and riding ability

  • USED YZ426F

Posted September 13, 2007 - 05:20 AM


That doesn't sound right at all. Your shock should still return to the pre-compressed height regardless of the rebound setting.

  • TeamPrecisionIT

Posted September 13, 2007 - 01:53 PM


In the suspension forum I was told otherwise, but I will be doing a service to it as well here shortly. Yes, I have done it before and am capable to do the work myself, I just haven't done it in about a year. The way it usually works out is every six months fork seals/fork fluid refresh and lubing of linkages and replacing bearing, and then once a year I would rebuild the shock. As far as weight and skill, I am 195, 6'3" (lean and fit) and am probably at a middle of the road skill level right now. Another thing is I didn't wait a whole lot of time but in the 30 or so seconds I did wait, the rear seemed to stay squatted. When I went around and rode it was just packing down the whole time but still was absorbing hits, albeit minimally. Can one of you guys with a stock shock go to the garage and write down you compression and rebound settings beforehand and try this out and see what happens?


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