If you call up I-Shock they have/had great support.
I called them after i bought mine.
Here are my notes.
HydroDynamics USA, Inc.
West Coast Regional Office
9303 Bond Ave. Suite C
El Cajon, CA 92021
HydroDynamics USA, Inc. : Home of the iShock™
Technical support: 619-390-2430
One week turn around for shocks sent in.
Shock controls all adjusters
Turning clockwise: stiffens / slows
Turning counter clockwise : softens/ speeds
Top of shock:
Brass screw = Low speed damper (controls shaft velocity) Slow rolling terrain.
Blue Nut = High speed damper (controls shaft velocity) Big whoops and air.
Bottom of shock:
Brass screw = rebound control
(how quick shock recovers from compression)
Spring Lengths and rates:
Rear springs: The rear shocks come stock with: 375 rating.
Spring rates available for the rears are: 400 and 425.
9.25 inches = Resting length of rear springs
8.50 inches = Max preload length of spring
Front springs: 220 spring rating - no optional front spring rates available at this time
11.40 inches = Resting length of springs
10.25 inches = Max preload length of spring