The bike is a 2006 YZ250 two stroke and I am looking for advice for the shock. I have revalved the forks and really like the changes I made, but I am struggling with the stock valving on the shock and looking for advice for what to change. Currently, I need to run the shock rebound at only 5 or 6 clicks out. I realize this is very slow rebound and it tends to pack really bad in acceleration bumps. If I speed up the rebound to about 8 or 10 clicks out it feels much better in corners and through acceleration bumps but my back end seems to get kicked up way too much off of jumps and it makes me lose confidence. I don't think it has to do with my technique. I've ridden plenty of other bikes and brands and never experienced this issue before. Do the stock YZ250 shocks tend to have too much low speed rebound? Or could some other aspect of my bike set-up be incorrect and causing this issue? I'm running about 98-100 mm of sag.

Edited by i_wheelie_longer, 26 June 2012 - 06:45 AM.

Well, you like a slow reb on jumps but you also feel the disadvantages of a clickersetting around 6.

So I would strengthen the reb stack and ride the clicker at 10-12.
Your stock reb is 36-0,20*9 28-0,11*1 36-0,30*1 34-0,30*1 32-0,30*1 30-0,30*1 28-0,30*1 26-0,30*1 24-0,25*2 22-0,25*2
21-0.30*1

You see the 2x24.25 and 2x22.25. maybe 24.3 and 22.3 would be more reasonable. At least the newer ones come with a taper like that.
Maybe clamping on 22 is also worth a try.
Or changing 2-3 .2 shims to .25 or .3

Are you using the std spring?

Try this stack.  Assuming you have the correct spring, you'll end up with it somewhere around 10-12 out, maybe:

36    0.30    12
36    0.30    12
36    0.30    12
36    0.30    12
36    0.15    12
36    0.15    12
36    0.15    12
25    0.11    12
36    0.30    12
34    0.30    12
32    0.30    12
30    0.30    12
28    0.30    12
26    0.30    12
24    0.30    12
23    0.30    12
26    3.00    12

Gray where would you start with the clickers with that stack?  I have never gone close to as stiff and run the clickers at about 12

Around 10-12.  It works wonders to get rid of the tail kick.  You'd think it would pack down pretty badly in whoops and stuff, but it doesn't.  It's one of Dave's setups.  I run something similar in my '06 YZ450 and it was one of the best things that ever happened to the bike.

you have never ventured that stiff mog? and i know you like to go on the stiff side of things for reb! lol

I don't see how the clicker can be at 12 ? Fully open yes

i have 7 of those .30 face shims and i clamp to a 24 (6.3 spring)clicker at 12 out.no packing and really nice small bump compliance in the bush.it works.

Lol with a 6.3 spring yes I can see that working!  On a 5.0 I ran hmmmmmm

My 350 2 extra 40.2 on reb and my clicker is fully open,  should have put it on restackor:-(((

mog:
I switched from 6x36.2 to 4x36.3 on my YZ 125 with 50 N/mm instead of 46 N/mm spring and it was unrideable on my hometrack which is nasty hard soil with lots of bumps all shape and seize. Even at 18 clicks open it kicked on breaking bumps.
At the moment I ride 3x36.3 and its fine.

I dont know why the Americans here run these extrem slow rebs. Maybe because the tracks over there are shaped more often then ours?!

I run the standard 5.5 Ti rear spring on the 450, and I run this:

36    0.30    12
36    0.30    12
36    0.30    12
36    0.30    12
36    0.30    12
36    0.30    12
36    0.30    12
36    0.15    12
36    0.15    12
36    0.15    12
36    0.15    12
36    0.15    12
36    0.15    12
36    0.15    12
28    0.11    12
36    0.25    12
34    0.25    12
32    0.25    12
30    0.25    12
28    0.25    12
26    0.30    12
24    0.30    12
26    3.00    12

Works great.  With the stock stack, the bike would ride in the back of the truck with the fender bobbing up and down waving to people.  Not anymore.  The back end is so well planted at speed in the rough now that the front end is less squirrely.

How can you mount all those shims? I had problems with some setups I wanted to try. There was not enough space on the rod, lol
What comp are you riding with this reb?

Thats really a extreme reb stack.

General question:
Why the 36.15 shims and not on equal amount of other thickness (calculated with shims conversion)?

Edited by Vietze, 26 June 2012 - 01:41 PM.

Vietze, on 26 June 2012 - 01:23 PM, said:

I had the same problem on my 125 with 4 36.3 face shims.  Rocks and roots were a problem even at 16-18 clicks out.  I dropped to 3 36.3 and it got a lot better.  I'm only running a 4.5kg spring though.

I should put that stack on restackor to compare,  the thing is,  no matter what track I don't see how the clicker wont be more out? I once ran just 12 faceshims 40.2 on a showa for a big spring and the clickers were wide open

3 is not a million miles from a std decent rebound

I tested Daves rebound stack. It was to heavy for me, around the track it wasnt that bad until the jumps.  The track I ride has lots of jumps and it was tough to get the bike to rotate properly for front wheel landings.

I feel most bikes come to light with their rebound stacks these days, but there is a happy medium, IMO Dave went to stiff. He used to be to soft, he needs to find that middle ground.

Edited by 455, 26 June 2012 - 02:38 PM.

Maybe its his oil which makes the difference?!

Vietze, on 26 June 2012 - 02:31 PM, said:

A little, but mostly its his stiff rebound stack.

But there are plenty of people who love his setups.
I meant maybe only his oil gets the shock working properly with this stiff reb stack?
I also noticed his relatively weak comp stacks. Stiff reb and weak comp makes the rear ride very low...