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'11 yz450f - too soft after service: help!

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I have about 40 hrs on my bike that I bought in July '11. 10h ago I had an oil service done fork and shock. The technician only beefed up the shock rebound with two more face shims because I was pretty happy with the stock suspension with a tad more fork oil and the springs for my weight that I fitted when the bike was new (220lbs intermediate/vet: 5,0 and 60N springs, rear sag 30/100mm).

Ever since the service the suspension suddenly seems too soft for me. I am bottoming front and rear (especially in the whoops) and the bike wheelies (jumps out of ruts easily) even though I run the clickers almost all the way in.

What happened?

- I am only riding for 3 years and I am constantly improving (found 5 sec. on the home track in the last year). Will this make such a difference?

- My tech used WP oil in the forks and I guess Maxima in the shock. Could this cause the massive difference?

- My tech reckons the suspension has finally broken in. Realistic?

I must have spend 3k in suspension mods of my previous bikes in the last three years and never was happy. I would love to find a set up with you guys and start things myself. If you have suggestions for a set up - please share!

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something sounds wrong, did he lower the oil level in the forks ? could be air in the shock ?

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i ve just revalved one for a guy yesterday.he's 87kg. without your kind of problem,stock suspension work great an this bike, i have mod the shock comp. shock reb as you and he run 18 out.fork on com and reb and a little mod on mid.all in stiffer direction.

yesterday the rider was very happy,i said to me , it incredible the difference.

it s big satisfaction for me.you ride the stock stak or a mod??post your riding stack

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Mog, I used to have 360cc in the forks and now I am at 375cc (believing he filled in 365cc as he said. The mech usually is accurate, kets the oil sit etc. It doesn't seem as obvious as air in the shock.

Our goal with beefing up the rebound was to get more bleed and calm the rear. It worked, but I had to increase the compression clickers significantly in order to get a similar feel.

I would love to get the rear to compress slower without giving up much plushness in the beginning of the stroke since I ride mostly hardback.

The fork only bottoms jumping into "take offs". Here I would love to have more plushness in the early part of the stroke without the fork diving more on braking.

The balance of the bike seems good (forks flush). This is why I haven't messed with the HSC.

Here is where we are (stock stack from kyb):

Fork: 5,0N/mm, Oil 375cc. C: 3 R: 6 (before service: 360. C 10, R 8)

Fork mid (stock):

reb

20 .1 3

12 .1 1

18 .1

16 .1

12 .1

11 .1

10 .25 2

mid comp

20 .1 4

17 .1 1

14 .15 1

11 .25 2

16 .15 1

17 .3 2

Fork Base:

32 ,1 15

30 ,1 1

28 ,1 1

26 ,1 1

24 ,1 1

22 ,1 1

20 ,1 1

18 ,1 1

17 ,3 1

11 ,25 1

14 ,1 1

18 ,1 1

22 ,1 3

Shock: 60N/mm sag: 30/102mm with approx. 8mm preload

HSC: 1 5/8 C: 4 R: 9 (5 for sand) (before service/ mod: C 10, R 9)

reb

40 ,2 6 (4=stock)

29 ,1 1

40 ,3 1

38 ,3 1

36 ,3 1

34 ,3 1

32 ,3 1

30 ,3 1

28 ,3 1

25 ,2 1

comp

44 ,2 13

34 ,15 1

44 ,2 1

42 ,25 1

40 ,25 1

38 ,25 1

36 ,25 1

34 ,25 1

32 ,25 1

30 ,25 1

29 ,25 1

28 ,25 1

27 ,25 1

26 ,25 1

25 ,25 1

23 ,25 1

22 ,25 1

21 ,2 1

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Fork Base:

32 ,1 15 + 26,1 (1) + 32 ,1 (3)

30 ,1 1

28 ,1 1

26 ,1 1

24 ,1 1

22 ,1 1

20 ,1 1

18 ,1 1

17 ,3 1

reb

20 .1 3

12 .1 1

20.1 (added)

18 .1

16 .1

12 .1

11 .1

10 .25 2

mid comp

20 .1 4

17 .1 1 + 17.1 1

14 .15 1

11 .25 2

16 .15 1

17 .3 2

+0.10under collar for stock float

380cc and free piston hole mod.

maxima 7 w oil

+5mm preload on spring

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reb

40 ,2 6 (4=stock) yes 6 work good

29 ,1 1 i use 30.10

40 ,3 1

38 ,3 1

36 ,3 1

34 ,3 1

32 ,3 1

30 ,3 1

28 ,3 1

25 ,2 1

comp

44 ,2 13 +44.2 (1)+ 42.2 (1) + 44.25 (1)

34 ,15 1

44 ,2 1

42 ,25 1

40 ,25 1

38 ,25 1

36 ,25 1

34 ,25 1

32 ,25 1

30 ,25 1

29 ,25 1

28 ,25 1take off this

27 ,25 1

26 ,25 1 take off this

25 ,25 1

in my shock stock there is 24,25

23 ,25 1

22 ,25 1

21 ,2 1 changed whit another 22.25

pull out 0.30 on cadj spring and

145psi

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I would love to get the rear to compress slower without giving up much plushness in the beginning of the stroke since I ride mostly hardback.

The fork only bottoms jumping into "take offs". Here I would love to have more plushness in the early part of the stroke without the fork diving more on braking.

Damping is speed sensitive, you cant valve it like "soft on the first 10 cm and then stiffer".

Dont know what to do with your shock, maybe I would stiffen LS a bit and then test...

On your forks I would like to know your float.

Anyway your description asks for less float.

Go to your usual oillevel. But I think a fork is allowed to bottom when you jump into the face of another jump:smirk:

But if you like it with more bottoming resistence add oil!

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Flaot should be ,20mm

Cardinal, could you explain what you are archiving with two crossovers? How much stiffer you recon is your stack?

Edited by Quernix

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maxim level oil is 370 you can t add other oil for bottoming vietze

Okay, why is this the max?

Does the manual say this or are there technical reasons?

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the manual say that but the reason is cause you must have a right quantity of air % in fork

if you go over the fork go on a wall of oil and lock the course. try that fork with 450cc

the bike lock 5-7 cm before the bottom but dont work.and the oil pressure spin strong in the fork component!it s difficult to explain cause ive not a better english !but you can put a lot of oil in your personal fork and try. i ve tryed and it s wrong.go over 5-max 10 cc.

i have try also 430 on showa crf2011 ,that s shit!!

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well if you add more bleed via a more open rebound on the shock it will be softer, I like the stack like ale uses with a single smaller cross over

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don't understand how the forks have got softer ?

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Maybe the forks only bottom when the rear has bottomed. Like I said before the forks are not my main concern.

What stack is ale using?

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Sounds to me like the inner chamber fluid level is too low. That and either air in the shock or not enough oil in the shock.

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