Not sure if this has been posted before, but I thought I would share what I came across in a 400ex owners manual. A lot of us buy used 400ex rear shocks, but have no idea where the previous owner set the compression and rebound screws to. This info is to reset the adjustments to factory stock dampening. Also, 400ex's are set up from the factory for 160 lb. riders. Hope this is helpful to some of you!
Rebound - Bottom Screw
Turn CW until stop (Full Hard)
Turn CCW Approx. 1 3/4 turns until reference punch marks line up.
Light load / Smooth roads - Turn CCW to soften
Firmer / Rough Roads - Turn CW to stiffen
Compression - Top Screw
Turn CW until stop (Full Hard)
Turn CCW Approx. 2 1/2 turns until reference punch marks line up.
Reduce compression (Softer) - Turn CCW
Increase Compression (Firmer) - Turn CW
Rebound - Bottom Screw
Turn CW until stop (Full Hard)
Turn CCW Approx. 1 3/4 turns until reference punch marks line up.
Light load / Smooth roads - Turn CCW to soften
Firmer / Rough Roads - Turn CW to stiffen
Compression - Top Screw
Turn CW until stop (Full Hard)
Turn CCW Approx. 2 1/2 turns until reference punch marks line up.
Reduce compression (Softer) - Turn CCW
Increase Compression (Firmer) - Turn CW