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Message: [QUOTE="MACE, post: 69720, member: 16716"] First my assumptions of the situation: 1. 1983 YZ has a remote reservoir with a floating piston (not a bladder). 2. You replaced the shaft seal by removing the lower clevis - since you say you didn't disassemble the valve head (piston with all the shims). 3. As indicated above, I assume a 1983 YZ has a piston with shims similar to later model bikes. 4. This isn't the YZ with the B.A.S.S. valving. Since you have rebound damping, I assume your piston ring is sealing adequately. I bet you have air in the top of the shock and/or in the remote res line. That air bubble flows through the compression needle orifice resulting in little damping for small to normal hits. You may be getting some damping after the bubble has been forced into the res and fluid is working in the needle valve instead of air. The rebound doesn't see the bubble because the shock piston and rebound circuits are down below the bubble. If you have a reservoir piston (not bladder) set the level as follows: [b]Guys, correct me if I get this wrong![/b] 1. Orient shock body and reservoir with the open ends up. Raise the remote reservoir until the res line is always climbing (i.e. no low or high points in line). Open end of res must be lower than open end of shock body. Clamp both bodies with vise and or clamps & lumber so you won't run out of hands as you bleed the system. 2. Open compression valve full open. 3. Fill shock body until fluid fills reservoir completely. 4. Rap all parts with a screwdriver handle to dislodge any trapped air bubbles. 5. Wet the oil side of the reservoir piston with fluid, make sure the res is full to the top and piston ring is in place - insert the piston into the res and push all the way down until it hits bottom. This will force fluid back into the shock body. Hopefully no bubbles will still be coming out by the time the res piston is bottomed. 6. Shut the compression adjuster all the way (lightly seated). 7. Wet the shock piston and insert into the shock body. Work the shaft up and down to dislodge air from the valve. 8. Open the compression valve and 9. If the res piston moved, push it back down. 10. Fill the shock body to the top and with the piston valve near the top, install the inside seal head retaining clip, the seal head and the outer clip. Fluid will be everywhere on your work bench by now. You'll learn to like it. 11. When you installed the seal head you should have seen the res piston move due to the fluid the seal head displaced. Now push the shaft in and you should see the res piston move some more - probably about 1/3 of the res stroke. If you don't have enough free volume in the res you can overpressure the shock on full compression. If you are really overfull you can hydraulic lock the shock. 12. Reinstall the res caps and you are ready to charge 'er up. Keep in mind I'm not an expert on this shock. I just thought I'd take a swing at your problem and figure if I'm too far off the real experts in this zone will correct me. ------------------ MACE Hey ho, let's go... Hey ho, let's go... Hey ho, let's go... Hey ho, let's go-o-o-o! [/QUOTE]

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