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moto_psycho

2010 yz250 kyb SSS shim stacks

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Hi all, does anyone have the stock stacks for this bike? I also really need to know the ID of each stack as well as I've done a fair amount of searching but cant find the base valve shim ID specifically.

 

Many thanks!!!

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Thanks for that!

Ok, I've got the base valve apart now, can anyone tell me what the purpose of the shims the other side of the steel plate is?

15499227980758959524602499594939.jpg

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Are you sure your forks are from the 2010 model year?

 

From the infos I've gathered, early 'SSS' forks had a passive bleed stack over the base valve's post 6 bleed holes (comp clicker circuit)

and on later 2-stroke 125/250, the bleed hole may have been left uncovered. (my 2010 YZ125 had no passive stack)

 

These 'passive bleed stacks' perhaps being more effective on heavier 4-strokes to counteract front end dive characteristics due to engine braking.

 

There are some '06 and '07 YZ 250 stacks listed here:

 

The Race Tech G2R Gold Valve kit for my YZ125 does not use a passive stack either.

Edited by mlatour

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I've switched a couple shims around, mainly closing off the bleed circuit and using an 11mm from the bleed circuit as a clamp for the BV.

Anyone recognise these stacks?

SmartSelect_20190212-071634_Keep Notes.jpg

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Not a million miles away from my 2007 KYB.
17x32.1

30.1->16.1

2x14.3

spacer

 2x11.3

14.1->22.1

 

I flipped the bleed stack to take it out of the equation  and shuffled things about to end up with...

6x32.1

22.1

6x32.1

30->14.1

11.3

spacer 20.1->16.1

11.3

 

Running 0.48Kg springs (im around 105kg). Only rode it around gently and felt good. 

Done a 3Hr enduro at the weekend and its not right at all. Very harsh on square edges and deflecting all over the place, enough to knock your hand off at times :(. Never been able to get my Gasgas to feel nice, tried many things with the Marzocchi 45s before getting the SSS to cure everything. Mates FE250 and 525EXC both feel significantly better and they are completely standard, maybe i need a 4t lol.

Edited by thompo

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9 hours ago, thompo said:

Not a million miles away from my 2007 KYB.
17x32.1

30.1->16.1

2x14.3

spacer

 2x11.3

14.1->22.1

 

I flipped the bleed stack to take it out of the equation  and shuffled things about to end up with...

6x32.1

22.1

6x32.1

30->14.1

11.3

spacer 20.1->16.1

11.3

 

Running 0.48Kg springs (im around 105kg). Only rode it around gently and felt good. 

Done a 3Hr enduro at the weekend and its not right at all. Very harsh on square edges and deflecting all over the place, enough to knock your hand off at times :(. Never been able to get my Gasgas to feel nice, tried many things with the Marzocchi 45s before getting the SSS to cure everything. Mates FE250 and 525EXC both feel significantly better and they are completely standard, maybe i need a 4t lol.

Interesting, these SSS are on my gasgas also!! I also have a '16 rmz450 with air forks that everyone moans about, I fitted the air pistons that are supposed to fix everything, and though better I still got the same harsh hits through the bars, so the next thing I did was as a couple of face shims, and place in a smaller clamp. I went from 16mm to 12mm, and that was too much, now I've set up a "2 stage clamp", so at the end I have,

20.15

18.15

16.15

14.3

12.3

This gives more room for deflection against the stop, and I personally believe on mega hard hits, allows a minor bit more deflection over 2x 14.3 (restackor agrees!).

 

Hence on the SSS I've closed the bleed stack and stolen an 11.3 and made it the clamp for the base valve.

 

I think us larger guys (I'm 95kg) need a bit less high speed damping, but more low speed to have a firm and controllable, but forgiving ride. It made a huge difference on my RMZ, so here's hoping. 

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