YZ 250 rear shock compression adjuster shim stack and spring

does anybody have the stock shim stack in the high/low speed compression adjuster of the rear shock? I am pretty sure it has not changed since 2006, when the 250 yz got the 18mm shaft. i also need the spring rate, and even better the spring measurements.

I just got a yz 250 2008 that belonged to a 220 lbs rider. I suspect they revalved the compression adjuster and changed the small spring with a stiffer one.


Edited by ugocross
wrong year

Thought it went 18mm in 06?

Thought it went 18mm in 06?

yes you are right, my mistake, it has not changed since 2006, thanks

the later ones(08 i think) have 2.7mm holes in the comp adjuster piston as well.

2008 standard:

2 - 18x.30

2 - 16x.30

2 - 11x.30


fantastic, thanks a lot. I got a hold of the 2006 stock valving specs of a yz250F and a yz450F too and they all have the same compression adjuster shim stack.

Now I need to verify the small spring in the compression adjuster. I measured it: lengh 28.0mm, outer diameter 19.14 mm, wire diameter 3.08mm. could anybody confirm that those are stock measurements? thanks

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now