Head Shake. - Kawasaki ZX-10R.net
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post #1 of 17 Old 05-26-2013, 07:15 AM Thread Starter
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Head Shake.

Hello; Mike here. I have a Gen 3 with a Carpenter engine that makes 188 RWHP on a known stingy dyno. The bike in crazy fast, and handles very well. It gets ridden very aggressively on the street, and I also do track days. I am getting a lot of head shakes when on the gas hard, especially at higher speeds. I have a Scott's steering dampner on the bike which obviously helps, but I still get them badly. I have the stronger spring on the rear shock from Race Tech, and I have 3 lines showing on the front fork preload. Any ideas from the suspension guru's what to do to lessen the head shakes? Back off the preload? Raise the back of the bike? Slide the forks up through the triple trees some? Any help would be appreciated. Thanks. Mike.
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post #2 of 17 Old 05-26-2013, 08:32 AM
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Start with the simplest issues known to cause this...Wheels/tires?
are they straight and balanced properly?


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post #3 of 17 Old 05-26-2013, 09:17 AM
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Well tighten up your damper! I have a scotts as well and I keep mine about a half turn from full stiff and have no problems.


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post #4 of 17 Old 05-26-2013, 10:13 AM
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Originally Posted by bgmagma10 View Post
Well tighten up your damper! I have a scotts as well and I keep mine about a half turn from full stiff and have no problems.


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I have a gpr and it goes 0-20 on the stiffness and im at 10...got a little headshake yesterday tightened it to 14....no problems! lol
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post #5 of 17 Old 05-26-2013, 12:25 PM
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front tire pressure, let some air out, the tire absorbs a lot of impact. hope this helps.

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post #6 of 17 Old 05-26-2013, 12:50 PM
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How hard are you holding to the bars?

Dont go stiffening up the damper, it will only mask the problem.

If you are riding "right" and still getting a lot of shake it is a chassis problem, fixing it will be a lot better than just cranking the damper.

"The ZX-10R is capable of being perfectly docile and tractable, but few men are capable of resisting its ever-present voice urging them to just twist it and see what happens."
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post #7 of 17 Old 05-26-2013, 01:22 PM
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Quote:
Originally Posted by rafa View Post
How hard are you holding to the bars?

Dont go stiffening up the damper, it will only mask the problem.

If you are riding "right" and still getting a lot of shake it is a chassis problem, fixing it will be a lot better than just cranking the damper.
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post #8 of 17 Old 05-26-2013, 04:57 PM Thread Starter
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The wheels are relatively new Marchesini's, and the tires were mounted, and balanced by the same place that always does them for me, so I don't think that is it. I have been riding for 30 years, and always on sportbikes, and I have ridden very hard for the last 20. I am very used to very high HP bikes, and high speed riding. I have had Scott's dampners on all of my bikes for the last 12 years, and am very familiar with them. I have it fairly tight now. I know that just cranking the dampner up is just masking something else, and besides I do not want to be fighting the dampner that much every time I turn. The bike is a real beast. It will effortlessly power wheelie at 140 in 4th. I've had it come up in 5th, and even 6th when it is cold out. I'm fine with that, but it just seems like whenever it does power wheelie at high speed it wants to shake it head. I have my suspension stiff as that is what I like for the hard riding that I do, but I just think it is a geometry issue. I was thinking maybe to slide the forks up through the triple tree's a little, and raise the rear end a little to change the pitch angle of the bike, and maybe that would help. I've never really messed with suspension settings that much, I've always worried more about the HP issue. I certainly have that covered with this bike, so now I need to get the suspension to handle it. I know there are plenty of people on this board who have a lot of suspension experience and that is why I asked. I do appreciate all of the help. Thanks. Mike.
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post #9 of 17 Old 05-26-2013, 06:44 PM
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Impressed with ur bike. Have u ever ran a gen 4 or bmw? Sounds like you'd at least smoke the gen 4..

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post #10 of 17 Old 05-26-2013, 08:33 PM
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Quote:
Originally Posted by 880turbo View Post
The wheels are relatively new Marchesini's, and the tires were mounted, and balanced by the same place that always does them for me, so I don't think that is it. I have been riding for 30 years, and always on sportbikes, and I have ridden very hard for the last 20. I am very used to very high HP bikes, and high speed riding. I have had Scott's dampners on all of my bikes for the last 12 years, and am very familiar with them. I have it fairly tight now. I know that just cranking the dampner up is just masking something else, and besides I do not want to be fighting the dampner that much every time I turn. The bike is a real beast. It will effortlessly power wheelie at 140 in 4th. I've had it come up in 5th, and even 6th when it is cold out. I'm fine with that, but it just seems like whenever it does power wheelie at high speed it wants to shake it head. I have my suspension stiff as that is what I like for the hard riding that I do, but I just think it is a geometry issue. I was thinking maybe to slide the forks up through the triple tree's a little, and raise the rear end a little to change the pitch angle of the bike, and maybe that would help. I've never really messed with suspension settings that much, I've always worried more about the HP issue. I certainly have that covered with this bike, so now I need to get the suspension to handle it. I know there are plenty of people on this board who have a lot of suspension experience and that is why I asked. I do appreciate all of the help. Thanks. Mike.

Mike,

Sounds like you know what you are doing.
Two things though, the light weight wheels will make the bike more "twitchy" than the stock rims, as in more unstable.

And 2, actually raising the front will make the bike more stable, maybe you could try that, lower the forks on the tree until they are flush.

"The ZX-10R is capable of being perfectly docile and tractable, but few men are capable of resisting its ever-present voice urging them to just twist it and see what happens."
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