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Discussion Starter #1
When Im accelerating hard the bike going straight is gets like shaking the head.

At first was violent, then I checked the head bearings and they where loose.
Then it is almost gone, I had to put harder the rebound on the back almost full closed and it liked it a lot, but sometimes when the street has imperfections It tends to do it.

I will receive a rebuilt damper, hope this helps.

Its a gen4.

the bike has a 5mm washer on the shock.

Any recomendations.
 

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Discussion Starter #3
I soldd it this way

teh head stering bearing was lose, helped a lot
maxed the rebound damping on the shock helped even more
the sag from 35mm to 30mm
by that time the bike was stable but not 100%

then I got the revalved damper and now is fenomenal
 

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Make sure the tyres are balanced well. I had head shake that i couldn't fix with any suspension input and it was caused by my d211 front being out of balance.
 

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Discussion Starter #7
Now the shakes are way less but exist....

Think its a geometry thing.... the back is raised 5mm and the front is stock.

I tried grabing the tank with legs and it made the shakes go.

but its stange to go on 5th WOT and slowly the head feells light and starts to wobble..

Any help is apreciated.
 

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Just curious why you raised the rear end 5mm? I'm not saying it's wrong because I raised the rear on my 600s but when you do that you are changing the rake which will cause more turn in but also reduce stability. I would take the shim back out to see what effect it has. Also put the rear of your bike on a rear stand and use a floor jack under your headers to raise the front of the bike off the ground. Pull and push on the front wheel to see if your steering stem has any play in it. Also check your tire for cupping and wheels for balance.
 

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Need a lot more info really... but to start at a guess.. Shock. More preload, less rebound, more comp. But alas all this could change depending on missing info.
 

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Discussion Starter #11
Less rebound makes sense since it makes the bike stay low on the rear more time since it rebounds slower.
 

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Less rebound makes sense since it makes the bike stay low on the rear more time since it rebounds slower.
In general yes.. but other things have to be taken into account.

So, to the questions.

Sag is at 30mm

Street or track use, Your weight/height, Spring, Stock linkage, Amount of preload on spring in mm’s?

Shock

Stock, Revalved stock, After market, make/model?

Rebound is maxed

In general not really wise to do this, That aside.. The cross talking of the circuits probably made it feel better, but bump absorption possibly may have suffered.


5mm shim

Any reason why?


Comp is -3 from full max

Is that clicks or turns?

HS comp ?

Settings on the fork? OEM, Fork height, Preload, Comp, Reb settings?
 

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Discussion Starter #13
Shock revalved
19mm of preload
195 lbs

Hcomp +2. From full soft

5mm shim. Usual mood to help in turn in

Forks stock
Stock fork height
From full hard
-2.5 rebound
-4.5 comp
-9 turns preload

Very agresive hi speed riding
 

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Shock revalved
19mm of preload
195 lbs

Hcomp +2. From full soft

5mm shim. Usual mood to help in turn in

Forks stock
Stock fork height
From full hard
-2.5 rebound
-4.5 comp
-9 turns preload

Very agresive hi speed riding
Is the spring top secret info?


And the spring is??
 

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First port of call is to address that spring, its way to light for you. maybe try adding more preload to get you by.
 

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You still didn't say if its a street bike or Track bike... But in reality for the most part It needs less shim than that. jmo
 
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