Nobody seems to listen you said Shock and you are correct. Rightside cover off difficult to see but there is a black slotted adjusting screw at the bottom of the shock. (The shock is inside the heavy coil spring) with arrows s - h go towards CCW. I'm still not sure how many times you can turn it but I got pissed that nobody answered your Question. The name shock means a shocking affect. shocks absorb the shock. You can google the full answer to how many turns just like I will.
Dude, you just resurrected a thread FROM 2009!! On top of that you are giving incorrect information on your first post.
The slotted screw at the bottom of the shock (the part attached to the swingarm) has NOTHING to do with how soft the shock is going to feel. That small screw adjusts your rebound. How the fluid internally flows through tiny ports. Adjust the screw clockwise, your rebound is slower and less oil flows through those ports. CCW, and your rebound reacts faster. Flow ports are opened. It's all a part of how the shock is valved.
The ONLY thing that is going to increase the "stiffness" of the shock is the large, black compression knob on the right side of the bike. It increases or decreases the spring preload, which in turn changes the amount of sag the bike has. Since there are no options to change to different weight springs, this is a very limited adjustment, so if you are an outlier when it comes to weight, there may not be enough or be too little compression for you.