is it something that would be in the clymer manual?
Never had a Clymer manual! It is spelled out in the CB750 Honda shop manual. Clymer's might have a step-by-step.
Loosen the lower cable adjuster, set the handlbar cable adjuster at it's mid-point. Don't worry about free play at this point, it's the last step.
On the right side cover you will see a small cover with a arge slot. Using the shock spanner from your toolkit (or a half dollar), remove the cover.
You will see a small nut and screw arrangement in the center of the hole. While holding the screw from turning, loosen the nut 2 turns. Now, while holding the nut, turn the screw in until it stops. Back out one full turn. While holding the screw, tighten the nut. Make sure the o-ring on the cover is clean, and put it on. Take the slack out of the clutch cable at the lower adjuster. Adjust free play [0.25"-0.50"] at the handlebar.
The way it works: The screw adjusts the clutch spring pressure, in is more, out is less. The nut is a locking device.