Polaris 2003 Pro X Service Manual page 245

Shock Valving
The valving piston has six large compression holes
and three smaller rebound holes. The smallest hole,
called the low speed hole, controls low speed rebound
damping. It also has about a 25% effect on low speed
compression. This hole is usually between .050 and
.100 in diameter. You can drill the piston with num-
bered drill bits to get any size you want. Blank pistons
are also available.
The rest of the valving is controlled by the valving
washers. These washers are available in various
thicknesses and diameters to achieve the proper
amount of stiffness.
Following is an example of available valving washer
sizes.
Washer Diameters
.700
.800
.900
1.000
1.100
1.250
1.300
1.450
1.600
Washer Thicknesses
.006
.008
.010
.012
.015
Use thicker, larger diameter washers to make the
shock stiffer. The rebound stack must start out with
a washer that is at least 1.250 in diameter. The
compression stack must start out with a washer that
is 1.300 in diameter. At slower shaft speeds, only
the washers closest to the piston will bend and allow
oil through.
At fast shaft speeds the washers bend further, so
the washers further from the piston are helping con-
trol the oil flow.
In summary, the washers closest to the piston con-
trol low speed valving, and the washers furthest
away affect high speed valving. In the rebound
stack, the washer next to the piston is more a me-
dium speed valve because of the oil flowing through
the low speed hole.
It takes a lot of time and practice to see which valves
control the way your suspension feels. Sometimes
it's good to make a big change to see how the shock
will react, and then end up somewhere in between.
NOTE: For every 1 of travel limiter spacers added to the shock, decrease the IFP depth by .115 .
NOTE: For every .25 of travel limiter spacers added to the shock, decrease the IFP depth by .029 .
REAR SUSPENSION/TRACK/TRACTION
Rebound holes
Slow
Shaft
Speeds
High
Shaft
Speeds
Piston
Compression holes
Washers
bent
less
Washers
bent
more
7.7