2011 45mm Marzocchi Manual or defaults?

[Thompo]

Hi folks, New here.

Picked up a UK 2011 250 cross country with 45mm Marzocchi forks (black tubes, black stanctions, no external preload adjuster) and Ohlins rear.

I searched the site and found a manual for Shivers but mine aren't quite the same inside as the manual suggests.

Is there a list of default shims for the various stacks?
Default spring rate etc?

Thanks for any info

[Radbuster]

Hi,

I bet GasGas UK special ordered that spec to avoid the hideous first Sachs 48 forks.

I would guess you would get close by looking at 2007-2008 EC250/300 documentation.

Mz Shiver 45's are your type with open-cartridge, Shiver 48's are the twin-chamber type.

Target weight for stock springs I think in about 70-80 kilos, which is too little for me. I'm 90kgs. Getting a 5.4 shock spring for wasn't a problem, but 4.5Nm fork springs was not easy. I finally found a suspension tuner here in Sweden that had a chat with Ohlins and he got me a set, but they were too short. I had to make a nylon spacer, to add to the stock black spacer under the spring, to remove any free play. Stock space in my fork is approx. 6cm and the homemade one is about 4cm. I'd rather have a longer spring, but that's secondary.

Shim stack is typical GG with lots of free-bleed.

Good luck.

[Thompo]

Apologies i forgot about this thread!

Thanks for the info had my first proper test ride over the weekend and it was terrible. Forks transmit EVERYTHING through the bars, 20mins riding mainly rough tracks and rocky patches 2nd-3rd gear mostly my hands and arms were done. Was a bit of a handful over brick size rocks just skipping and jumping about. Tried moving bars, levers adjusting clickers no good.

Swapped bikes with my mate, WR400 his felt so composed and comfy, would glide over bits i was being thrown around on, could ride all day on it but had to stop as my mates hands hurt after 5 mins on the gasgas

Pulled the forks apart tonight to set about trying to make them work.
Any advice? Im 105kg looking for an enduro setup no MX, clubman sort of standard with a trials background.

7.5wt Silkolene, new seals and bushes. 110mm air gap

Paint is off rear spring and i havent got the fronts out yet to measure.
front sag is 80mm, rear 105mm so im guessing springs are about right unless damping is masking something.

this is the valving i found on the base.
23x1
23x1
23x1
23x1
23x1
23x1
23x1
23x1
23x1
23x1

11x2

22x1
22x1
22x1
22x1
21x1
20x1
19x1
18x1
17x1
16x1
15x1
14x1
13x1
12x2
12x2

Seems like a load of shims compared to anything i have found admittedly these all appear to be 0.1mm thick which i havent seen either.

Havent got the tools to get into the rebound valve yet but the clicker doesnt have much effect so i guess it needs some work too.

Thanks for any info
Neil

[motopsycho87]

Turn the base valve upside down and try the same stack again. I've not tried this yet but if you read my thread I've already gone too far to try it. The restriction to the rebound should help as should the additional area to the compression.

[Thompo]

Good thinking!
Had been looking at modifying the existing piston or making something along the lines of a gold valve after reading the ports are very restrictive.

Found a problem stripped the other leg....
base valve came apart as i buzzed it out, dunno if buzzing it out caused the screw holding the stack to come out or not but i had to go fishing to find the screw spring and check plate.

Additionally the stack is missing a load of shims on the HS.
Stack is
23x1 x10
11x2
22x1 x4
21x1
12x1

its missing 20,19,18,17,16,15,14,13,12 shims and they arent inside the fork

[motopsycho87]

Wow that's a mismatch and a half! Still, I wish I had even that amount of shims to play with...