max is 300. I would use the fox pump and empty the shock out. Twist the preload collar to midway then pump 275 psi into the shock so it fully extends. Take breaks while you pump it cause the air/pump gets warm and screws up he reading. When you get all the 275 in it, let out air to 250 then sit on the bike bounce around and see how you like it and keep dropping air from there. Im 165 and I ride mine at 170-180 It almost is your weight and i have the preload collar in the middle (its numbered 1-5 so it makes it easy for adjustments) If you still feel its soft after doing this, the preload collar really can make that shock stiff so empy it out and start twisting it. good luck. It will take a while to set up but once you do, that shock kicks booty