http://www.progressivesuspension.com/metric/440series/index.htmlGo to the website #440 instruction sheet (PDF)... 10 full 360* turns, and reference marks (threads) appear above the top turning shock head. My eyes aren't good enough to read them, so I marked the shock slightly and counted the turns. Both sides adjusted the same is good.
The shocks come from the factory set to the cushiest /softest setting, and turns (clockwise to increase preload) begin to show the reference threads (supposedly one thread is one full turn). It's hard enough to turn them when new.... after a while it is worse, especially with the OE bags in the way. Spray some penetrating lube up in there. I believe it is easier if you raise the bike on a jack just enough to take the weight off the rear tire/shocks... but not up in the air with the wheel/rear end hanging on the shocks either.