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[QUOTE="imq707s, post: 69718, member: 22450"]
I just rebuilt the rear shock on my 83 YZ250.  I have never rebuilt a rear shock before but I figured it was worth a try before I spend $100 having somone do it for me. I dissasembled the shock, but did not dissasemble the valve head. I also replaced all of the seals and o-rings.I used ATF fluid like many on this board have suggested.  Once I had the shock assembled and charged I put in on the bike to test it out.  The shock has good rebound dampening, but almost no compression dampening.  It almost feels like the shock has no oil in it at oil.  Here are a few things that I think might be causing the problem, would some of you suspension wizards please tell me what you think.

1.  Some air might be trapped in the shock.
2.  Incorrect pressure on the nitrogen reservoir.

Are you supposed to fill the reservoir with as much oil as it will hold before you fill it with nitrogen?  I just pushed the plunger in the reservoir about half way in before I filled it with oil.  That means that half of the reservoir is filled with nitrogen.  Could that much nitrogen be compressing and letting the oil flow in and out of the reservoir under compression?  Any other ideas?  Would someone please go through the steps of filling the shock with oil. Thanks.

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