Gen 3 chattering/harshness - Kawasaki ZX-10R.net
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post #1 of 16 Old 08-13-2017, 02:47 PM Thread Starter
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Gen 3 chattering/harshness

Hi all!! A month ago I purchased a 08 Kawasaki ZX10R (3rd gen) as an only-track bike. It has some goodies, *brake pump, fairings, 520 transmission, front and rear revalved, etc.*


The day to test the bike arrived, *it was in Cheste, Spain.* Sunny day, warm, 30+ celsius degrees.*


Dunlop KR106 comp. 1 front, kept at 2.3 bar during the whole day

Bridgestone V02 medium rear, kept at 1.7 bar.*


I started adapting myself to the bike. The thing is, *when I wanted to push a little, the bike chatters as hell, it feels harsh mid cornering, and that obviously keeps me away from riding hard.*


Previously I had put new fork seals and new ohlins 1309 oil, 490ml/leg as per manual.


First I thought the rear was topping out and that was causing the chattering, *but I took a good amount of preload away and that didnt solve anything. Then I thlught i could have poored too much oil in the fork, *but I checked and its ok. Also tried closing rebound rear, nothing. I have to say the front rim has a hit, *and the sidewall is bent. However no air is lost, *nor does it vibrate in straight line or releasing the bars. It was balanced without problems. The hit is on the right side, *and chattering happens on both left and right handside corners.*


Dynamic SAG is 27mm front and 25mm rear. I send you a video where the chattering can bee noticed and some pics of the tyres.

Has there been a case like this? I have heard this bike is pretty difficult to set up suspension wise, but I think this is not normal.


What could you recommend?


Here is the video


https://youtu.be/mZ7hs89U7d0


Thank you very much!!!



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post #2 of 16 Old 08-14-2017, 05:09 PM
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My first guess - your tire pressures are a bit off. On the Dunlops here in the US, if my pressures are off just 1-2 pounds for the temp and pace the bike will chatter all my fillings loose. Proper pressure at the proper pace and it smooths right out....

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post #3 of 16 Old 08-14-2017, 10:26 PM
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I've tested the same dunlops on my s1000rr and hated them because of the same chatter issue and because I race on Pirelli I just didn't want to waste the time to find the best suspension setup so I went back to Pirelli. Got the tires for cheap was the only reason I was using them.

I don't pay much attention to SAG numbers anymore just mostly go by how the bike feels but 27mm total SAG is very hard. Also, not sure where mechanical bottom is on the Gen3 forks but it looks like you have a lot of travel left, so you might need less preload or lighter springs to start with.

I did notice that the chatter went away when I reduced the hot tire pressure from 2.4 to 2.2 but then I started to rip the front tire. I think Dunlop have a smaller setup window then Pirelli for example and tire compound has to be correct for the track or you'll find it very hard to get a correct setup.


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post #4 of 16 Old 08-15-2017, 07:36 AM
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Stiff V02 rear shakes sometimes, I run it 1.5bar hot and 2 clicks softer compression compared to Pirelli slick.
Other than that: Loose fairings, too much front compression damping, too tight chain, steering head bearings.

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post #5 of 16 Old 08-15-2017, 12:51 PM Thread Starter
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Thank you all for your answers!!!

I have also read that these Dunlops it quite difficult to get a good suspension setup. Perhaps the rigidity of the carcass requires more work from the suspension. So the conclusion regarding to tires is that stiff carcass tires are not the best options for this bike? I read that this bike is pretty stiff, and that may require softer tires.

Regarding to sag, fully extended fork I get 139mm between the lower foot of the fork and the dust seal, plus some mm of the topout spring, that makes around 142mm of space, and the full travel according to manual is 120mm, so I think im not far away from the bottom.

Next trackday I will swap to pirellis FR+RR and check the steering head bearings, as well as the chain tension.

Did you have the same chatter as in the video??

Thanks again!!!!

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post #6 of 16 Old 08-15-2017, 03:11 PM
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27mm of rider sag in the front?

Sag is a mathematical equation of overall stroke? You want to be in the middle 1/3 of the available stroke of 120mm of fork travel so you should be around 38-40mm of rider sag.
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post #7 of 16 Old 08-15-2017, 03:20 PM Thread Starter
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I have already tried less sag front, less sag rear, nothing solved the chattering.

I brake really hard. If I wasnt using the whole travel I wouldnt have that sag...

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post #8 of 16 Old 08-15-2017, 03:22 PM Thread Starter
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Its stiff ok, but I have tried less sag... Nothing

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post #9 of 16 Old 08-15-2017, 03:30 PM
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Brake dive should be controlled by the damping not the spring rate or sag. Sounds like you have a poor set-up that you are trying to band-aid with unorthodox settings and that never works especially on a bike like the Gen3 ZX-10R that doesn't handle that great to begin with under the best circumstances.
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post #10 of 16 Old 08-15-2017, 03:33 PM Thread Starter
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Spring supports, damping assists

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