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77
Joined
11/17/2015
Location
NF
Edited Date/Time
2/2/2017 4:22pm
Hi,
I disassembled my forks of a 93 CR125 (Showa 43mm) andd messed up the the sequence of the shims.
This doen't concern the valve on the bottom of the fork, but the valve that slides up and down.
The left and right fork seem not to be valved equally either. On one side, the thick washer even is right on top of the valve.
Is it normal that left and right aren't valved equally? And has anyone a picture or desciption of how the shims need to be placed?
Thanks!
I disassembled my forks of a 93 CR125 (Showa 43mm) andd messed up the the sequence of the shims.
This doen't concern the valve on the bottom of the fork, but the valve that slides up and down.
The left and right fork seem not to be valved equally either. On one side, the thick washer even is right on top of the valve.
Is it normal that left and right aren't valved equally? And has anyone a picture or desciption of how the shims need to be placed?
Thanks!
It would help if you had pictures to see what you have
Then I took apart the right fork leg and the rebound valve fell on the table again! Nothing really mixed up, I only didn't know how to turn the actual valve. Now I've put all parts in a row, I saw that already. However you also clearly see that there's a huge difference between the two assembly's! So the PO must have assembled something wrong. This is really strange, because the fork damper and damper rod didn't show any signs that they have been opened before. One has to drill several small press points before being able to unscrew them.
Please not the compression valve in the corner has nothing to do with the shims pictured here, it still is assembled.
The Shop
The only people with the actual stock shim stack sequence and shim sizes are people like Race Tech, Pro Circuit ect, but they do not share any of that information, plus it's been over 20 years and that information gets lost in cabinets or boxed and stored when moving.
Next way is to get another matching used unmolested part and disassemble it, if you do not have the stack list then it's always just a guess. Everything matters and that piston has an up and down if you look closely the ports are not the same on the top and bottom.
Last thing is to maybe slowly match the discoloration on the washers with what you think is the right way to assemble the stack, usually that piston and washers have wear marks to see what was lined up where, use a very bright light.
I've been where you are and now slide the stack on to a zip tie and make special marks for UP, been screwed for time making the same mistake.
Good luck with the lowering project.
I have the shorter spring and spacer. Only remaining step is ordening the shims...
Starting with the first picture of the reb/mid valve, re check and measure #22 to check it's an 11.2 and not two 11.1 stuck together. Check #17 & #18 to verify they're 21.15 & 21.1, hopefully they are both 21.1. Is #7 16.2 or two 16.1 stuck together. Are #5 from the left side and #20 from the right both 6id x 8od collars(can't tell if #20 is a shim or collar) and how tall are they, should be the same height 1.95mm, 2.05mm etc...
Also the rebound pistons should have a bleed port in them, Y/N and if yes what is the diameter if the hole 1mm, 1.5mm etc...
Second picture of the base compression, #9 in the right 18.15? should be 18.1. #2 on right 12.2 or two 12.1 stuck together.
Most of what you need is there with a few missing and a few that don't belong there, but I need those answered to get you close to know what you will need to find.
No, R#22 is a single shim 11x0,2
Yes, R#17 can indeed be 21x0,1
Yes, R#7 appears to be 2 pcs.16x0,1
Yes, L#5 and R#20 are 6id x 8od collar, both 2,5mm tall
The bleed hole is the one in the picture below? That's 2mm.
Base compression:
Yes, R#9 is 18x0,1 I'm measuring with manual caliper. Would lean more toward 0,1 than 0,15 indeed.
No, R#2 is a single shim 12x0,2
To make things even 'easier' I found another shim of 8,5x0,15mm on the table, during double check. Don't know where it came from.
Would you like me to reorder them and take a new picture?
To get sticking shims apart, I rub them between my fingers or pull with my thumb nail. Any other way to do so?
Thanks slipdog
On your rebound #15 & #16 don't belong, 21.25 is ridiculously stiff for a fork shim. 25yr old technology is a bit weird, but for now pull those two aside. Someone removed all the rebound shims from the left and doubled them up on the right. Coming off the rebound tower each side should have 1ea of.
#7/25 the cup
#6/24 spring
#5/20 collar
#3/21 check plate (22.45/22.5)
*rebound piston
21.1
20.1
19.1
18.1
17.1
16.1
15.1
14.1
12.25 clamp shim
(#8 17.15 doesn't belong in that stack, kind of looks like a blue KYB shim too)
I don't see a picture on your post, but the bleed hole will be in the side of one of the piston ports. If it is 2mm that is kind of big and maybe in '93 they thought that the 21.25 were a good idea to keep the rebound from being too springy with that much bleed. Normally you'll have 21.1 x 4 or 21.1 x 6 instead of one 21.25, but can't be too sure here.
I don't have 2 pcs 12.25 to use as clamp shim. That R#1 and R#2 are 12.25 and 13.25
R#8 looks 'burned blue'. Can take it out. Should I take out L#2, R#22 and R#23 as well? R#23 is 18x2mm.
Base compression:
L#2 really is 9.15 and the one I found 8,5.15
What to do with this shim stack?
Here's the picture:
Don't you mean this with the bleed hole? That's approx 1.4mm. Each rebound valve has 3 such holes.
3 bleed ports in the rebound is a lot and that tells me that those 21.25 shims do belong in the stack. One on each side first off the piston before the 21.1s.
I'm heading to a superbowl party right now, I'll help you with the base valve from my phone after I'm there. May be 1-2hrs before I'm back here...
If better I can make identical base plates on a lathe.
The stack from the base plate up to the piston should be something like.
17x1.5 Base plate
9.15
10.1
11.1
12.1
13.1
14.1
15.1
16.1
17.1
18.1
19.1
20.1
21.1
Piston
Check plate(21.5x.4)
Collar
Spring
Cup
Nut
Pit Row
Not really sure what to tell you now other than I'd try to fine a replacement cartridge for the fluted one because standard valving won't work with what was done there.
Must have been someone smart, one wouldn't destroy the complete valving system without a purpose. Looks like a way to make it progressive..,
Compression damping (Right leg, top adjuster)
>affects entire stroke
Turn open when the fork feels harsh at short hard bumps
Compression damping (Right leg, bottom adjuster)
>affects LAST 60mm
-Turn open for short hard holes
-Turn close for longer sand bumps (more damping)
Rebound damping (left leg, top adjuster)
>affects entire stroke
- Turn open for short hard bumps
- Turn close for longer sand bumps
Rebound damping (left leg, bottom adjuster)
> affects start of stroke
- Turn close when the wheel slides away (like a flat tire)
- Turn open when the fork feels harsh at small holes
This adjuster is most affecting the sensitiveness of the fork.
The top adjusters sound logic to me. I only don't understand how each bottom adjuster can have a different effect. The adjusters only adjust the bypass flow, isn't it?
This design still retains a standard base valve and the mid compression is just a check plate giving very little damping unlike the Cobra's almost solid mid so I would assume that's why they consider the base valve on the fluted side as the bottoming control adjuster(last 60mm). That would seem to me to be much less effective than the CARD design since it will bleed so much pressure off through the check plate mid and base valve stack, but I have no experience with this Reiger system.
I would also agree that the base valve should have no effect on rebound adjustment since they work on a check plate refill system. The adjusters bleed will only be effective when there's resistance through the piston via a valving stack so the adjuster can bleed off pressure. With a check plate there is no pressure to bleed off.
Obviously your best bet at this stage it to consult Reiger on the system you have since all my earlier advice with the valving was before I knew the one side was re engineered.
Do you have any unpinning idea's? might get around with the rebound too and give out you the info..
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