Marzocchi 45 shim advice?

M

motopsycho87

New member
Hi everyone. I've reslrung my bike for my weight 95kg (0.47x5.7) and love the feel of the springs, but the damping still feels harsh at the top of the stroke on small bumps, and rebound adjustment seems non existent. The bike had heavier springs in when I got it but I'm still not sure if it was revolved.

Can anyone recommend me a shim stack for plush over small rocks etc, but man enough to tale big hits (jumps).??

Thanks!
 
If you take the time to pull the forks down and record whats in there now I'm sure we'll be able to provide a few suggestions.
 
I'm thinking it would be safe to assume I have whatever is standard for the 06' ec300, as I have the same complaints of not much rebound damping and harshness over small bumps... :confused: maybe? lol
 
I have a 2011. I don't have shim info but I had the exact same harshness with my bike when it was new. I had mine valved with added SKF seals by WER here in the US. HUGE Difference! They are awesome now, no harshness at all. Its the best money I have ever spent. I've been riding the bike for the last three seasons without any changes.
 
Need to know the mid valve setup including float.

Those stacks on TT are a pretty drastic change with a load of free bleed.
 
Im looking at possible valving issues too, Ive fitted heavier springs again (the ones from this OP) and still have a very soft first half of the compression and a no real rebound control at all, its the weirdest thing. It feels as if its spring only till midstroke when pushing it down and then it rebounds fast, riding it now does feel better but you get the feeling your low in the stroke to start with and the front tucks under often. Did some flat landings off a 2metre drop and it didn't bottom out ? I had about 15mm of travel left in stroke, so Im guessing oil level is good.

Ive got about 30mm of spring preload to be able to fit cap, and bike sags around 35mm under its own weight (forks) Im going to try thicker oil first as this may slow travel down a touch, anyone tested oil weights in these shivers ?

I have spent years racing mx so Im still getting the feel for an endure bike, are they set up this soft/plush or should they be near mx settings, as it could be me looking for what Im used too ?
 
Sounds like too much free bleed. Same advice as before though. Tear em down, confirm the stack, consider some changes to address described issues, order some shims, and then evaluate. Probably do that again to fine tune.
 
?

Today Ive been told that the shivers should have 10 or 7.5wt fork oil ?

Can anyone confirm this, as Ive been using 5wt
 
What I mean is that even comparing one brand of 5wt to another brands 5wt doesn't mean they are the same viscosity.
 
It's supposed to have 7.5wt oil. I put valvoline maxlife atf in mine as it works out around 7.5, dexron 2 and 3 are closer to a 10w but if I were you i'd aim for about 12.5 at the very least.

http://mahonkin.com/~milktree/motorcycles/fork-oil.html

Bare in mind you won't find a 12.5w fork oil so select a thinner 15w from the list. Also, while your low speed (round edged bumps) damping may improve, your high speed damping will get harsher (sharp edged bumps).
 
motopsycho87 said:
It's supposed to have 7.5wt oil. I put valvoline maxlife atf in mine as it works out around 7.5, dexron 2 and 3 are closer to a 10w but if I were you i'd aim for about 12.5 at the very least.

http://mahonkin.com/~milktree/motorcycles/fork-oil.html

Bare in mind you won't find a 12.5w fork oil so select a thinner 15w from the list. Also, while your low speed (round edged bumps) damping may improve, your high speed damping will get harsher (sharp edged bumps).
Click to expand...

If you can't get 12.5 oil, mix equal quantities of 10w and 15w of the same brand/type of oil to achieve 12.5w. I used to do this for my road race bike for early/late season (15w for cold weather), 17.5 for mid season (15w+20w), and 20w for a particular track in the hottest month. Plus it kept the oil fresh.
 
The labelled weights don't mean much. The viscosity is what matters.

I believe the Marzocchi 7.5wt is around 26.40@40cSt and 9.90@100cSt
In comparison Silkolene RSF 5wt is 26.70@40cSt and 9.46@100cSt

Thats just one comparison. Also, regardless of what the manufacturer recommends, its also just another tuning variable and more importantly is selecting a particular oil and working with it to achieve the desired goals. A lighter oil will pass through the valves quicker. Lighter compression damping, and a faster rebound.

In my closed chamber I've been using Amsoil 5wt hich is only 15.9@40cSt and 4.4@100cSt.
 
Well Ive been playing around with these 45's and think Ive got it dialled now.

Ive made from delrin 20mm spring spacers to give the fork a bit of help as I felt it had a lot of sag and soft feel in the first part of the stroke, as well as going from my 5wt oil up to 10wt. Oil level was good as it resisted bottoming by around 10mm landing on flat ground from a 6ft drop. The fork now feels a lot more progressive in its travel, and does not dive through the first half as quickly.

Ive a day woods riding planned this weekend so time will tell, just hope it don't start pushing the front in corners or over roots :)
 
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