Help with Marzocchi eta fork pressure

GOLDGPR

Hi all,

I have some xc600 forks am trying to get the sag set up correct looking through the manual the left hand fork (with the ETA on) is the pre-load but when you look at the pre-load section in the manual it says the pressure is diffrent for ETA forks but doesnt tell you what it is. the other side is fine that is just 0-15psi

But does anybody know what pressure the ETA side should be if it matters my weight is 78kg.
Many Thanks in advance

nicklouse

what ever you need.

the ETA side is a spring. set the air side to what give the right sag..

whatever feels right. from 0 to 15psi on the ETA side.

please check your fork as there are no 2008 XC600 eta's

did they come on a bike? what model and year?

GOLDGPR

Hi Nick,

No these are 2007/6 forks they are after market ones not OE ones.

So is it that the ETA only needs enough pressure to actually work ie lockout?

The manual states the right leg with the RV on is the Positive Air so is this the leg where the sag is set if so do i leave the other leg(ETA - Left) empty while doing that?

Ta G

nicklouse

the ETA does not need any air. the air is only for preload if you need it.

the ETA side is coil sprung not air. the lock out (with 30mm of travel) is purely mechanical.

the other leg is air sprung.

GOLDGPR

So in that case what is the preload for should that be set to my weight.??

nicklouse

there are no figures.

like i said what feels right and between 0 and 15psi.

GOLDGPR

Right think that i have got it sorted now. made the fork a lot smoother was thinking i was riding a rigid.

Have now got the
LH fork with roughly 10psi (leg with ETA)
RH fork with around 20 psi and correct sag

Now when going over small bums ie fire road i am getting a rattle - do they all do this? or is it to do with the oil/rebound? When rocking the forks there is some flex/play in them so didnt know if they needed the lowers tighting to the uppers (how do i check)

Ta G

nicklouse

no air in ETA. then set sag with the right leg,

then tweek the ETA side preload.

the ETA is mechanical. and air has nothing to do with it. It is NOT a lock out. it is a lock down that always allow 30mm of travel.

and at 78kg i would expect 45psi in the right leg.

and the fork name is the XC RETRO 600.

GOLDGPR

Could have done with that answer first nick but thanks for the replies it is helpful

What would you sugesst for the rattle over small bumps (by the way check that the headset wasnt loose).

Regards

nicklouse

thats what happens when i have a day off work, i spend time trying to see what fork people are talking about. then whay hey 6 manuals later there is the answer in the manual.

Like i implied at the start the figure is just a guide. what pressure you need will all come down to what pressure you need to get the sag correct.

the fack it is an air fork would lead me to belive that people would set the air pressure first. and then set the preload to tune.

the rattleing mmmm might be beacuse you have too much air in the ETA side. could just be one of those things springs do rattle. Might be your cables....

GOLDGPR

Cheers Nick will try the pressures quoted and get the sag set-up correct first. Fingers crossed the rattle will go then.
Many Thanks

realnumber 1

I have these forks and there is alittle flex/play when fully extended. I also find that the right leg needs very little air pumping in it (I weigh 10 stone)
I can find out what the psi is when I get home but I only did a a few pumps of the pump.
I havnt bothered changing the psi in the left (eta) leg

GOLDGPR

That would be great if you could let me know the psi's also could you advise how many turns you have on the rebound (ie start anticlockwise 3)
Thanks G

realnumber 1

GOLDGPR wrote:

That would be great if you could let me know the psi's also could you advise how many turns you have on the rebound (ie start anticlockwise 3)
Thanks G

Just had a look and my psi is at 25 at the min but was thinking of going a little higher (30 maybe). I don't think I've ever gone over 35 in the past.. As for rebound I have it set at 1 1/2 full turns clockwise at the min.
It seems okay at the min but in fairness I'm no expert on shock setups and have tried all sorts of settings and cant decide which is best :oops:
Out of interest how did you get to the the air valve with your pump, do you have an adaptor?
By the way when I said above about the bit of play in them that was normal (remember reviews saying the same) but they don't rattle like you say. Just good old squelching so you might want to check that.
I was using my PDA before and couldn't be bothered typing all that

GOLDGPR

Been slack aint managed to get to try changing the presures yet so going to give it ago one night this week.

With regards to the fork leg with the smaller valve then got an adaptor with the forks for that. The other side is just a normal screw on car type valve.

Thanks for your help.

realnumber 1

GOLDGPR wrote:

Been slack aint managed to get to try changing the presures yet so going to give it ago one night this week.

With regards to the fork leg with the smaller valve then got an adaptor with the forks for that. The other side is just a normal screw on car type valve.

Thanks for your help.

I don't remember getting one of those with mine, just the bits for V's and the plugs. I will have to try and order one.
Cheers!

GOLDGPR

It does look like a V-post when you see it you might of chucked it. Think that they are about a fiver.

G