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Old 01-14-2008, 06:21 PM   #1
Zerodog OP
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Ever wonder what is inside your 640 shock?

Now you know!! Here is the inside of my shock. I needed to put a new seal in and I decided to try out some different valve stacks. I have some ideas......they could be good.....or could totally suck and I will be doing this again shortly.

All of the washer looking things are the shims that control the oil flow. These items are arranged in the shock when it is revalved. The thing on the left with the holes is the piston body. The piston separates the compression side from the rebound side. It also controls oil flow to the shims.



The LC4 shock is totally different than the standard PDS style shock in any other KTM. The PDS shocks have 2 pistons a needle and about twice the amount of shims. I will have to post one of those next time I get one apart.
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Old 01-14-2008, 06:46 PM   #2
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Yo Dawg! Your gonna get mine to tear apart into littlebitty pieces in about 3 or 4 days! Its boxed up and ready to ship mon-yawna.
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Old 01-14-2008, 07:08 PM   #3
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If you weren't so far away i would send my shock to you.
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Old 01-14-2008, 08:28 PM   #4
Tuff Tunica
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Slc???

What the? An LC4 suspension expert right here in SLC? I live in Park City and have had the shock for my 625 SXC sitting at Palo Verde suspension since before X-mas. Still no word. Had I known I'd have brought it to you. Where are you located and I guess I should ask do you do this kind of thing for others? I'm guessing from post #2 that you do.

Tuff Tunica screwed with this post 01-14-2008 at 08:58 PM
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Old 01-14-2008, 08:39 PM   #5
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Yes I work on shocks and forks. I specialize in Lc4s because I am one of the few tuners that ride one all the time. So I know what the bike does under the usual riding conditions. It sure as hell isn't MX or serious desert racing. Most guys want a focus on dirtroads and easy trails.

I do other suspension stuff for other KTMs too, with a focus on trail and desert riding.

Zerodog screwed with this post 01-14-2008 at 08:47 PM
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Old 01-15-2008, 03:43 AM   #6
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Z-dog,
Another KTM mystery unveiled.
Thanks,
b.
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Old 01-15-2008, 05:34 AM   #7
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Hey, mine looks like that; only all together...

You can leave most of that stuff out, it only adds weight.

Which one is the spacer that is added to the Adventure shock to limit travel?
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Old 01-15-2008, 06:04 AM   #8
Yooper_Bob
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I could easily pull mine apart....getting it all back to together, however
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Old 01-15-2008, 06:26 AM   #9
Loadedagain
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yabbut... can you get it all back inside the tube it cam out of?
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Old 01-15-2008, 06:39 AM   #10
Luke
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Interesting. I'll have mine apart after my new spring arrives. So I was wondering why the rebound shims were so much smaller- guess the inner ports on the valve are the rebound and the big outer ones the compression.
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Old 01-15-2008, 09:11 AM   #11
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Quote:
Originally Posted by Mtncrzr
Hey, mine looks like that; only all together...

You can leave most of that stuff out, it only adds weight.

Which one is the spacer that is added to the Adventure shock to limit travel?

The spacer is the brown thing on the left under the piston. It is about .5" thick.
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Old 01-15-2008, 09:48 AM   #12
Mtncrzr
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Zerodog, thank you.

Are you going to put a bladder in the new shock or stay with the piston?
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Old 01-15-2008, 10:08 AM   #13
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Quote:
Originally Posted by Mtncrzr
Zerodog, thank you.

Are you going to put a bladder in the new shock or stay with the piston?
No bladders, bladders are for pussies! I like the pistons. They last forever, work very well and I find they are easier to deal with. I have a vacuum bleed system for doing KTM shocks.
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Old 01-15-2008, 11:50 AM   #14
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Zerodog,

Is it pretty much trial and error with various shim stracks until the you hit upon the charactestics your looking for? When you have a shock/ fork revalved are they just altering (adding or subtracting) to the shim stack?
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Old 01-15-2008, 01:31 PM   #15
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It is and isn't trial and error with the valve stacks. You know what the problems are you are trying to fix. So you address those areas with certain configurations of shims. Different arrangements give different effects. But getting just the right set up is trial and error part. That is why testing on the bike is the best.

Yes for the most part revalving is changing the valve stacks. Sometimes it can also involve changing the pistons too. But revalving is the general term.
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