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Old 02-04-2013, 11:20 AM   #31
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Joined: Sep 2009
Location: California City, Ca
Oddometer: 113
Co2 becomes liquid under certain pressure, think it's around 700 psi. Not sure if shock head pressure could hit that during use but if it did I would think it could make some weird things happen.

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Old 02-04-2013, 11:28 AM   #32
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Joined: Aug 2004
Location: Idiotville, OR
Oddometer: 4,241
CO2 might not work so well if you ride in really cold temperatures. At that pressure it can liquify if it gets really cold- zero degrees F sort of thing. That probably won't hurt anything, the shock just won't work quite right until it warms up.

If that bothers you, use air. It works fine. The only hard part is getting the pressure right if you use a regular air chuck, an MTB shock pump is perfect for this.
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Old 02-04-2013, 09:34 PM   #33
Desert Silver
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Joined: Jul 2007
Location: Lucerne Valley, CA
Oddometer: 14
Originally Posted by bmwktmbill View Post
My guess is that N is more stable temperature wise than CO2.
The shock gets hot.

Some Tire shops might have N in a tank if you ask around.
Ya I know, I'm just going to use the Co2 for one short ride and then switch over to N2. My main concern is CO2 screwing up the reservoir in some way. I don't want to invest in the N2 until I'm sure the shock is working ok. I can probably get it filled at Noleen for a small amount of money. It's to bad they don't make N2 cartridges like they do Co2 cartridges. It was actually very easy to get the pressure right with the Co2 tire filler. I would use just plain old air but I haven't been able to get my silka bike pump sealed up enough to pressurize the shock that high.
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Old 05-02-2013, 12:53 PM   #34
Joined: May 2013
Oddometer: 1
For the WP 4681, this thread is by far the best How-To on the net! Thanks.

As many of you may know, the WP4681 also comes on lots of the linkage MX bikes '94-older, before KTM's brief use of Ohlins. Thanks to this thread, I have found that many of the small service parts listed here work for that shock as well. Things such as O-rings, dust seals and so on. It's tough to find an exploded view of that earlier shock, and many of the original part numbers have been updated to what's shown here. Searching for the old part numbers doesn't get very far! So the part numbers listed here are very helpful. The seal head was updated to what is pictured in this thread around '91 on the MX bikes. My older stuff has a multi-piece seal head that is not nearly as good. Although I have not yet needed to, it may be possible to swap in this later stuff if we also use the matching end cap.
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Old 06-26-2013, 08:18 PM   #35
Gnarly Adventurer
Joined: Mar 2007
Location: Aspen, Colorado USA
Oddometer: 410
question to followers of this thread

I've posted a comparison thread [here]

I'm wondering if the shock featured in this post is similar enough to my own mystery shock for me to order the parts that Tseta lists in his original post?

I'd appreciate some feedback on my thread.

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Old 06-26-2013, 09:54 PM   #36
Joined: Jul 2005
Location: Traveler
Oddometer: 5,219

Call them.
'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing

The faster it goes the faster it breaks.
And high performance=high maintenance.
Bill Shockley
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