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April 30th, 2004, 04:49 AM   #11
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Hey Simon,

I know this stuff can be a bit confusing, however, dave186 is correct.

First set the "race sag", that's with you and all your gear on sitting on a hard flat surface, like the garage. Let's say you set the race sag at 3 3/4" of an inch. Then get off the bike and see how much "free sag" it has.

If, as dave186 says, the free sag is less than 3/4" then your spring is too soft. Reason being that you have had to put too much pre load on the spring to hold you and the bike up to the right height. If the spring is too stiff, then you won't have enough pre load on the spring to hold the bike up to the right height when it is unloaded.

Free sag is just a function of spring rate and rider weight, and un loaded ride height. For instance, if the spring rate is too soft, ie too little free sag, then one could encounter bottoming problems that would have to addressed with hydraulic damping to keep it from bottoming. And the result would be a much harsher ride. And too stiff springs would produce an overall harsh ride.

And I agree with dave about this being THE most important suspension setting. I have found with my berg that ride height is crucial for proper handling.

I hope this helps,
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April 30th, 2004, 06:14 AM   #12
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Originally Posted by DaleEO
Hey Simon,

I know this stuff can be a bit confusing, however, dave186 is correct.
Hi DaleEO,

Not really confusing at all - I read the 2 paragraphs independently of each other between cups of coffee so kind of lost my train of though (easily done I know!) - process = Race sag, then free sag and when the suspension is cold, I might add

However, it is interesting that WP advise doing it differently. E.g. setting the static drop to 35mm using just the preload adjustment and then using total sag with rider on to set the spring rate. if it is outside approximately 90-105mm a different spring should be used.

I use this process as I find it takes less time

What would be interesting is to find out if the 2 processes yield different results overall. Anyone tried?

Originally Posted by DaleEO
And I agree with dave about this being THE most important suspension setting. I have found with my berg that ride height is crucial for proper handling.
Absolutely no argument there!

Simon
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April 30th, 2004, 11:07 AM   #13
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I use progressive springs, and since the selection is more limited, I cant get the perfect spring for me. The best way in that situation is to have shock and fork springs that are balanced, if you see what im saying. then just set the free sag and dont worry to much about what the rider sag is, adjust the preload according to handling.
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May 15th, 2004, 02:51 AM   #14
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Come on its not that difficult to set up. If you can make an ash tray you are better off saving yourself some money and having ago at the suspension yourselves. I hate giving my money away for anything that I can do myself. If you want to get the most out of your bike you must get the suspension close to the ball park. Just read the tips while sitting in your shed looking at your Berg and it will come to you. At the least set the sag.
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October 7th, 2005, 04:31 AM   #15
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Re: A guide to basic suspension tuning

Hi. I have just recently purchased a FE450 swapping over from a Yamaha WR250f. I have only riden a small amount of k's and alredy have had troubles overheating on a ride, but otherwise have enjoyed the experience. My only drama is i find the bike extremly stiff in the rear. I weigh 76-78 with gear, is the stock spring correct or are you able to suggest the correct for a trail riding purpose. Or do you think it is possible to find the correct setting just with the clickers. And if so can you suggest a setting to try.

Much apprectiated
bergfe450
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October 7th, 2005, 05:03 AM   #16
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berg fe450

welcome to the site mate and i'd just make the following points first;

be nice to know a name at the bottom of your posts-if your not hanging around though, it doesn't matter!
be nice to know which country, indeed which county you're from.
trust that it's a '05 450 because the '06s are now out and they started making them for '04. see the problem?

suspension? check your sag but it looks like you are light enough to unwind the spring until it is only just held by the adjuster ring. remove the spacers from the top of the forks.

then and only after you get the springs right do you adjust the clickers. unwind the compression and rebound then wait to be launched through the roof = supress this with rebound. compression is coz the bike can't hack several bumps.

simple!

regards

Taffy
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May 21st, 2007, 02:04 PM   #17
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Oki, I´m in the same position as the 450 guy...

and my raceweight is almost like his... let´s say around 75 kg...

I´ve got the original springs on both in forks and shock, and as I know it they should be suitable for my weight...

Am I getting you right, Taffy, that I should back the preloadring on the shock all the way back up, so that it just holds the spring in place...

and...

that I should remove the preload in the forks... do you mean the white plastic rings on top of the springs...that has always been there?

As always I hope that you get what I mean...

thanks

/Rikard
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May 21st, 2007, 02:15 PM   #18
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i can't really say how i would start from scratch really? i got to where i am the wrong way!

to me, you adjust all the clickers and record the results. also you try more or less preloadd on the spring. a classic situation is that you get a softer ride but that in tight spots the bike no longer turns OR you tigten the preload, raise the back end and she steers beautifully but alas you are sat upon a road drill!!!!!

so i tested first!

i also used the ride height figures as a guide and that's all. then i started realising that the difference in the preload was so minimal that i couldn't tell whether i needed another spring or not. now i know that even 4mm of preload probably means that the next stronger spring would improve the ride. at the time it seems negligable to say that the 260mm spring is better at 256mm so i need a heavier spring! but it's what i found.

as for the forks i'm again going to say that you must check the sags and again they are only a guide. but they do tell you which way to go if you want to try something. you really should build a leg the way i describe it in the doc though. then you'll know how many plastic rings represent being 'spacers' and how many are considered to be 'preload'.

knowledge is power so go get the knowledge. the fork sag numbers are notoriously difficult to get.

regards

Taffy
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May 21st, 2007, 09:00 PM   #19
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Hi bomeme
If you have stock springs they most likely too light for your weight, what I remember
40 front and PDS3 in the rear they really makes the bike ride low that is kind of
hazardous in the woods, my suggestion is to go with 44 front and if it feels off you can
reinstall 40 spring in one leg and you will have with the two fork legs combined 42
leave the plastic pre load shims in the fork (you can experiment with later)
in the rear it is little more complicated if you run your chain adjustment all the way at
end you are not likely to make parameters for sag reason for that is that the axle is
further away from the shock that creates more leverage, if you run the chain as short
as you can you are more likely to make the sag numbers as I remember I was right on
edge with my 01 400 but I weigh 10 kilo more than you so I think you can make it,
the PDS3 spring is not the best it is rather soft in the middle and end of compression
if you put a stiffer spring in the back you might have some rebound issues since the
rebound stack in the shock is on light side and I would not recommend revalving the shock it is not worth the money, you can find newer used shock on e bay for less money
when attempting to improve suspension you have to identify the problem, make a plan
to improve, stick to the plan, and only do one thing at the time
good luck VIKING
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May 27th, 2007, 02:01 PM   #20
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ok... good guide!

I´m wondering...

what is G-outs and G-loads?

And, this afternoon, I was out riding... working on my suspension... and it´s hard to find the right spot between soft and plush...

but today...I think I found soft... it´s very nice... eats everything... but it also ate my stability!!! Am I correct about this... I felt an "doing.. doing" effect...

respons on this would be good...

Thanks!

/Rikard
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