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April 10th, 2017, 11:17 AM   #1
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FE390 4860 CC Forks Setup

Help please guys.

My 2012 390 front end feels harsh and firm on slower enduro type going.

Is it worth trying a 2.5W oil? Play around with the shim stacks?
Does anyone have a shim stack setup that would give a plusher ride on the slow rooty rocky stuff?
Are there any aftermarket valve kits that are worth trying?

Based in UK

Many thanks
Ace Vinduro
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April 10th, 2017, 12:30 PM   #2
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i recommend you DON'T go for 2.5W. you can't really do thjis at home IMHO although there are some good "Slavens Racing" videos on youtube. but as for the valving.... go to KTMtalk in the USA and see what you can't gleen from there...

Taffy
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April 10th, 2017, 10:05 PM   #3
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Have you bled the air from them?
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April 10th, 2017, 10:40 PM   #4
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I've tried bleeding them, no air seemed to come out.

I've replaced the seals and oil before so happy getting inside the forks. I used Plutoline 5W oil, wondering if a different oil would be worth trying
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April 11th, 2017, 07:55 AM   #5
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do You have bleeders on You forks. If you do air should be able come out or in if not that's a problem. Look their first.

Last edited by Rainerio; April 11th, 2017 at 10:09 AM.
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April 11th, 2017, 09:35 AM   #6
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Originally Posted by Ace Vinduro View Post
Help please guys.



My 2012 390 front end feels harsh and firm on slower enduro type going.



Is it worth trying a 2.5W oil? Play around with the shim stacks?

Does anyone have a shim stack setup that would give a plusher ride on the slow rooty rocky stuff?

Are there any aftermarket valve kits that are worth trying?



Based in UK



Many thanks

Ace Vinduro


Wouldn't softer springs help ???


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April 11th, 2017, 01:44 PM   #7
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Thinner oil helps a lot yes.
Also try reducing the preload on the fork springs
For specific stacks this site is Bare. try Ktm talk or as a general approach increase the mid valve float by 0.1 mm makes a big difference in cc fork.
Valving kits waste of time in general on these forks if you want to try one the best imho is that offered by Adam kreft. Kreft Moto
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April 12th, 2017, 01:56 AM   #8
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If you want to get in the deep end, then this is some rather interesting software: Shim ReStackor, Finally software to tune a shim stack

(Btw: "Don't use thinner oil" without qualification or context means nothing except to reveal the BSer, again.)
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