Bike setup question

Acidreamer
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1797
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8/25/2015
Location
Mansfield, OH US
12/5/2017 5:07am
Having some issues with bike stability. Riding an 09 kx450. Its sprung for my weight.

Im having problems over small chop in 4/5th gear. Bike will bounce off everything and cause headshake down straights. My sag is around 4.5” to try to compensate for the stability issue and i dont want to go any more because thats already well over 110mm.

The forks are lowered in the clamps all the way. & compression is 4 clicks out.
My fork sag looks to be 2-3” or so. I feel like this is a lot and causing the front end to be really low. The low speed damping on them is really soft. So when i want to corner it will turn on a dime.

Not sure where i should go with the clickers or preload settings. I have picked up around 5 seconds over the fall. Wonder if i need a revalve & setup from a company?
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aees
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1338
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8/20/2015
Location
US
12/5/2017 7:29am
Spring fork? Add one step stiffer spring, or some oil. So you can back out on clickers instead.
RussB
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750
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7/12/2014
Location
GB
12/5/2017 8:28am
More preload will raise the forks in their stroke, so this could be a good start if you feel they are sunk too low in the travel.

4 clicks out is quite stiff. so if your forks are low in the travel this could make them feel harsh. The combination of being low in the stroke and a firm compression setting could be causing your issues... just speculating.

Don't neglect your body position either, being too forward on the bike can create headshake
Acidreamer
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8/25/2015
Location
Mansfield, OH US
12/5/2017 8:47am
RussB wrote:
More preload will raise the forks in their stroke, so this could be a good start if you feel they are sunk too low in the...
More preload will raise the forks in their stroke, so this could be a good start if you feel they are sunk too low in the travel.

4 clicks out is quite stiff. so if your forks are low in the travel this could make them feel harsh. The combination of being low in the stroke and a firm compression setting could be causing your issues... just speculating.

Don't neglect your body position either, being too forward on the bike can create headshake
The springs i have are the heaviest racetech offers. Im 250lbs so suspension is a struggle lmao.

I have some preload washers im going to throw in when i rebuild my forks this week and see how that works.

I can basically sit on the rear fender and it still doesnt feel right. It fixes the headshake but then the ass end doesnt feel planted and the front starts bouncing more.

I want to think with more preload on the forks, it will raise the front of the bike up and allow me to soften the damping since there will be more low speed available. then the forks can absorb more of the bump and not bounce around so much. In theory anyways

The Shop

slipdog
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10041
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7/25/2009
Location
Nor Cal, CA US
12/5/2017 2:27pm
Acid, what is your current spring rates?
Acidreamer
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1797
Joined
8/25/2015
Location
Mansfield, OH US
12/5/2017 4:09pm
slipdog wrote:
Acid, what is your current spring rates?
Forks are .54
Shock is 6.6
slipdog
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10041
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Nor Cal, CA US
12/5/2017 7:44pm
That seems to be a very good balance front to rear for your weight. They have been known to give "closest available" and they're not correct for the weight and also not balanced front to rear. Just had that this week and had the customer send the springs back.

Those forks work well between 6-8mm of installed preload, IMO, and check for broken free pistons and leaking lower cartridge seals
Acidreamer
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1797
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8/25/2015
Location
Mansfield, OH US
12/6/2017 3:58am
slipdog wrote:
That seems to be a very good balance front to rear for your weight. They have been known to give "closest available" and they're not correct...
That seems to be a very good balance front to rear for your weight. They have been known to give "closest available" and they're not correct for the weight and also not balanced front to rear. Just had that this week and had the customer send the springs back.

Those forks work well between 6-8mm of installed preload, IMO, and check for broken free pistons and leaking lower cartridge seals
Thanks for the input. Ive got 4 of those preload washers racetech sends with their springs. Im gonna put them in today when i service my forks. Hopefully it helps.

despite stability issues, the bike feels pretty damn balanced when im not going in 4th/5th gear.
Acidreamer
Posts
1797
Joined
8/25/2015
Location
Mansfield, OH US
12/6/2017 3:59am
slipdog wrote:
That seems to be a very good balance front to rear for your weight. They have been known to give "closest available" and they're not correct...
That seems to be a very good balance front to rear for your weight. They have been known to give "closest available" and they're not correct for the weight and also not balanced front to rear. Just had that this week and had the customer send the springs back.

Those forks work well between 6-8mm of installed preload, IMO, and check for broken free pistons and leaking lower cartridge seals
Thanks for the input. Ive got 4 of those preload washers racetech sends with their springs. Im gonna put them in today when i service my forks. Hopefully it helps.

despite stability issues at high speed, the bike feels pretty damn balanced

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