45mm shivers no adjustments??

[darren]

I have a GG EC250 1998 with 45mm Shivers off an 07 bike.

When i first fitted them the Rebound and Compression adjusters made noticable difference when used.

I did Strip and service them when i fitted them and again 6months later.

At present winding the comp and reb adjusters fully clockwise there is no change in the fork character. In fact it is like riding a pogo stick at the mo.

I stripped one fork leg and checked the shim stack was intact, ( i did not bother to strip the other due to the fact they are both the same)

I was wondering what could be wrong. The marzocchi site talks about Inner rod pin blocked. Blocked compression and Contaminated oil.

Would these problems affect both settings? comp and reb
I know the oil is not contaminated.
Blocked compression would that affect rebound also?

With the inner rod pin I assume that would be the rod that sits in the tube which the rebound stack is attached to?

Also is the inner rod supposed to have a point on it? if it is then that could be my problem as mine looks fairly flat.

I wondered if the rebound piston seal/bush maybe was worn and allowing oil to pass around it instead of through it. But would that also affect the compression?

any help much appreciated. The manual i was looking at was on the website below.

http://www.marzocchi.co.uk/techinfo.html

[darren]

I stripped the forks today and thoroughly cleaned out everything. The forks were quite clean. The bottom valve was clean and free of obstructions, and the taper valve was clear and free.

I did notice that the check valve has additional shims on and the rebound stack is stock for the 07 forks.

I am at a loss now as i still have no noticable adjustments on comp and rebound.

I think they may need to go to a specialist if i get no help here.

[nick790]

Bad oil?
Rebound piston seal?

[darren]

Thanks nick.

The oil i am sure is and was ok as i had no problem when i first changed the oil Jan 09, and it is the same oil as i put in after teardown.

The Rebound piston seal i thought could be the problem but how would i know? Also would it be too much of a coincidence that the seal has gone on both legs at the same time?

thanks for the reply.
darren

[nick790]

The only obvious thing left, I'm affrayed.

You did something wrong mate

[darren]

Originally Posted by nick790

The only obvious thing left, I'm affrayed.

You did something wrong mate

How do you mean?

[nick790]

Originally Posted by nick790

Bad oil?
Rebound piston seal?

Hope it sorts the problem, let us know

[darren]

Originally Posted by nick790

Hope it sorts the problem, let us know

Credit to you to nick. I will keep you updated.

darren

[darren]

I know its a little off the original thread i may also post this as a new thread, i have listed my shim stacks below just to see what response is received, and mabe i can make some adjustments accordingly while the forks receive the new rebound piston ring.

Some of the shim sizes seem a little odd compared to others i have seen posted see what you think.

I am 76kg + kit
Average clubman not worried about comfort just speed and stability.

NOTE i have done nothing with the shim stacks.


Rebound

Spring
15x0.3
15x0.2
15x0.3
22x0.3
11x0.2
Piston
21x0.1
19x0.1
17x0.1
15x0.1


Compression

Spring
22x0.3
Piston
11x0.2
22x0.12
11x0.2
20x0.12
19x0.1
11x0.1
18x0.1
17x0.1
16x0.16
15x0.2
12x.12

As i said some of the shims are odd (0.12)

Reading other posts on the site i thought mabe pulling the comp piston bleed shim 11x0.2 and also the first on the check valve (11x.02)
I cant be too radical as i only have the shims listed to play with.

[bergerhag]

Originally Posted by darren

I wondered if the rebound piston seal/bush maybe was worn and allowing oil to pass around it instead of through it. But would that also affect the compression?

sorry for not reading your post thoroughly. Yes a worn inner tube seal would affect compression too. That is the piston that drives the suspension fluid through the compression valve/shim stack. If it fails, both circuits will degrade