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Trailryder42
Amarillo, TX
USA
1085 Posts |
Topic started on 07/30/2003 at 11:12:23 AM
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Anyone know what part of the valve stack is the hi speed compression? I'm thinking of experimenting with my forks valve stack to soak up rocks better. It's my '00 XR400.
Well I found out the info I was looking for and removed 6 of the 12 .004" washers of the shim stack, leaving 6. Rode Tres Ritos, N.M. this weekend. If you've ridden there, you know how rocky it is. Hi speed compression over rocks was much improved and allowed me to ride faster thru them as the forks soaked them up without transfering so much shock to me. Now just have to work on the shock to get the rear to do the same thing.
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2000 XR400R - 440 kit, Mikuni pumper, Hebo hydraulic clutch, WER suspension
2003 Red Kawasaki Meanstreak
2004 KLR650
Tech: XR400R High-Speed Compression Fork Valve-Stack Mod |
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mcdavis
Ridgecrest, CA
USA
143 Posts |
Posted on 08/22/2003 at 4:23:52 PM
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did you find the info out on the yahoo group xr400? i found out the same thing, leave six shims at the valve bottom of the fork. seems to work better now as well. sure is cheaper than send them away.
any idea how many shims should be in the other valve on each fork. i guess the are the low speed shims? |
97 XR400R |
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bluestragler
Canon City, CO
USA
545 Posts |
Posted on 08/22/2003 at 5:15:02 PM
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| Don't you bottom out a lot easier now? |
'01 XR400, '97 XR250, '96 XR200, '91 XR200, '99 XR100, '96 XR80 |
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Trailryder42
Amarillo, TX
USA
1085 Posts |
Posted on 08/23/2003 at 07:23:03 AM
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mcdavis, by the "other valve" I assume you're talking about the ones at the top of the forks. Those are your rebound valves, not slow speed compression.
Hey Pete, no, I don't bottom out easier. You use the clicker settings to adjust for big hits like from landing jumps or G outs, as the clicker needle determines how much oil flows thru the base valve bleed passages. Removing shim washers from the valve stack allows the suspension to react faster/more plush to things like stutter bumps, rocks, roots and such. I wish I had done the mod before our trip to the Rainbow tr. |
2000 XR400R - 440 kit, Mikuni pumper, Hebo hydraulic clutch, WER suspension
2003 Red Kawasaki Meanstreak
2004 KLR650
Tech: XR400R High-Speed Compression Fork Valve-Stack Mod |
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bluestragler
Canon City, CO
USA
545 Posts |
Posted on 08/23/2003 at 08:36:48 AM
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| Well, I might try the same adjustment then. I could sure use the help getting over some of that Rainbow cobblestone. Thanks for the info. |
'01 XR400, '97 XR250, '96 XR200, '91 XR200, '99 XR100, '96 XR80 |
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mcdavis
Ridgecrest, CA
USA
143 Posts |
Posted on 08/24/2003 at 12:06:16 PM
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trailryder
hold up. there are only two valves with shims right? the clicker bolt at the bottom of the forks (the one i assume you removed shims from) and the shim stack that resides on one end of the rod assembly (the other end of which has the rebound clicker bolt)
did you find any information about this second valve stack?
thanks |
97 XR400R |
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Trailryder42
Amarillo, TX
USA
1085 Posts |
Posted on 08/24/2003 at 7:45:44 PM
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mcdavis, I removed the shims from the valve/clicker assembly at the bottom of the fork tube(compression), as the stock XR forks are undersprung and overvalved. I haven't replaced my springs yet but I have added a 3/4" spacer under the fork cap to increase preload. The range of rebound seems to be fine so I haven't messed with that valve assembly, the one you speak of that's at the end of the damper rod. I have no mod info on that stack.
Derek |
2000 XR400R - 440 kit, Mikuni pumper, Hebo hydraulic clutch, WER suspension
2003 Red Kawasaki Meanstreak
2004 KLR650
Tech: XR400R High-Speed Compression Fork Valve-Stack Mod |
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mcdavis
Ridgecrest, CA
USA
143 Posts |
Posted on 08/25/2003 at 09:49:09 AM
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Derek
ok, I know what you did now. I guess the other valve shim stack is fine found no info on it. I agree, remove those shims at the bottom valve made a significant improvement on sharp edged bumps etc.
I'll have to try that spacer for the preload |
97 XR400R |
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Trailryder42
Amarillo, TX
USA
1085 Posts |
Posted on 08/25/2003 at 12:58:21 PM
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| I think I could have lived with the existing fork preload and springs if I hadn't mounted a big 'ol IMS 4 gal tank on the bike. The extra weight of "it" full, necessitated more preload on the springs. It's a temp measure until I get around to putting 42kg springs in it, if I ever do. |
2000 XR400R - 440 kit, Mikuni pumper, Hebo hydraulic clutch, WER suspension
2003 Red Kawasaki Meanstreak
2004 KLR650
Tech: XR400R High-Speed Compression Fork Valve-Stack Mod |
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ThumperTDC
Thumpalicious
USA
6395 Posts |
Posted on 11/25/2003 at 11:14:26 PM
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| So what was the final verdict of this mod, I know you have covered alot of ground since.......good......bad? I am seriously thinkin about trying this one out when I tear into my forks here soon. Anyword on the rear shock? |
 Bikes can be modified but only one can be Thumpified, Nicely Thumpified 98 XR450 - This is how I roll in OR & in ID
In loving memory of my son Nicolas "Cole" Allen Carter 10/5/2005
I donated to the support of 4Strokes.com |
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Trailryder42
Amarillo, TX
USA
1085 Posts |
Posted on 11/26/2003 at 06:55:43 AM
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| I'd say "good". Fork is more plush thru the rocks and bumps. Go for it. |
2000 XR400R - 440 kit, Mikuni pumper, Hebo hydraulic clutch, WER suspension
2003 Red Kawasaki Meanstreak
2004 KLR650
Tech: XR400R High-Speed Compression Fork Valve-Stack Mod |
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crashxr
Rhode Island, NY
USA
118 Posts |
Posted on 12/04/2003 at 4:47:38 PM
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hi guys ,
i've been absent from the forum for awhile . good to see some of you folks are still around . anyway , i did this mod and found small bumps soak up niecley , large square hits are much less harsh !! this is an easy mod and well worth the effort . |
99 xr400r - Gordon Mods, uni filter, vortip exhaust baffel, 160/60 , whips bash plate, pro ralley hand guards, wc fram guards, racetech fork and shock springs |
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SuperPro
San Francisco, CA
USA
39 Posts |
Posted on 12/09/2003 at 12:59:43 AM
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| Will someone please map this out a little better? I'd love to do this on my xr400 considering how much the suspension sucks! |
97 XR400 with gordon's mods and a homemade subtank |
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Trailryder42
Amarillo, TX
USA
1085 Posts |
Posted on 12/09/2003 at 07:27:40 AM
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| How technical do you need us to get? Do you have a shop manual? DO you know how to remove the bolt in the bottom of the forks? If none of this, PM me with your email address and I'll scan and send you the procedure as well as what to do with the compression stack. |
2000 XR400R - 440 kit, Mikuni pumper, Hebo hydraulic clutch, WER suspension
2003 Red Kawasaki Meanstreak
2004 KLR650
Tech: XR400R High-Speed Compression Fork Valve-Stack Mod |
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ThumperTDC
Thumpalicious
USA
6395 Posts |
Posted on 10/27/2004 at 3:03:49 PM
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I'm in the process of doing this as we speak. I will take some pictures when I start in on my second fork and will post them when finished.
As for the shock, this was some info I got from another XR400 rider
quote:
Originally posted by Jeff in RC
We wanted to plushen up the rear end and here is what we did, on both the high-speed and low-speed compression stacks we removed one of the 5 shims that are the exact same size and re-assembled the shock. We also set the nitrogen at 150psi. This had a huge effect and really plushened up the rear end.
After I get the forks done I am off to do the shock. The oil I am using is AMSOIL suspension fluid. There are 2 different weights, light and medium. I went with the light oil, I will keep everyone informed once everything is finished, and will have pictures along the way hopefully showing everything. |
Bikes can be modified but only one can be Thumpified, Nicely Thumpified 98 XR450 - This is how I roll in OR & in ID
In loving memory of my son Nicolas "Cole" Allen Carter 10/5/2005
I donated to the support of 4Strokes.com |
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ThumperTDC
Thumpalicious
USA
6395 Posts |
Posted on 10/30/2004 at 6:26:07 PM
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| Just got the bike back together to test it out. I removed 6 shims like what was mentioned in some of the original posts. The fluid I used is a 5wt oil, the medium is a 10wt and I thought that might be a little too much. I did a brief ride on the property and I have to say this, it will take some time to get it dialed back in but what a huge difference in the way it handles. The front end is so plush now its amazing. I can't wait to service the shock and give it the same treatment and then go test it out in the woods. I can say this, if the shock performs as well as my forks do right now, I'm gonna be flying down the trail. So far i am happy with it, I'll post more after I get some good time one the bike after I get everything finished. |
Bikes can be modified but only one can be Thumpified, Nicely Thumpified 98 XR450 - This is how I roll in OR & in ID
In loving memory of my son Nicolas "Cole" Allen Carter 10/5/2005
I donated to the support of 4Strokes.com |
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Topic |
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'00 XR400R fork high-speed compression valve stack
