Snowmobile Arctic Cat (2008 year). Manual - part 111
7-4
ADJUSTING FRONT SHOCKS
(Fox Air Shocks)
The air shocks are individually adjustable for the terrain
conditions and driving style of the operator. The ski
shocks are initially preset at 4.6 kg/cm
2
(65 psi) on the
Crossfire Sno Pro/F-Series Sno Pro and 4.2 kg/cm
2
(60
psi) on the M-Series Sno Pro. The rear arm shock on the
M-Series Sno Pro is preset at 9.8 kg/cm
2
(140 psi).
However, it is possible to “fine tune” the shocks to
match the operator’s weight, riding style, and terrain
conditions.
NOTE: Care should be taken to have equal pres-
sure in the shocks before operating the snowmo-
bile.
To increase or decrease air pressure, use the following
procedure.
NOTE: Adding air pressure will increase the air
spring force; reducing air pressure will decrease
air spring force.
1. Remove the air valve cap from the shock.
2. Thread the valve of Air Shock Pump onto the
shock air valve approximately six rotations.
NOTE: As the pump is being attached to the
shock, the hose will fill with air. This will result in a
lower gauge pressure 0.14-3.52 kg/cm
2
(2-5 psi).
3. To decrease air pressure in the shock, press the
black bleed valve button half way down and hold
until desired pressure is attained.
NOTE: Pressing the button fully down and
releasing it will allow only a small amount of air to
escape (micro-adjust).
4. To increase air pressure in the shock, pump until
desired pressure is attained.
5. Remove the pump valve from the shock air valve.
NOTE: As the pump valve is being removed
from the shock, the sound of air loss is from the
pump hose, not from the shock.
6. Install the air valve cap onto the shock.
FRONT ARM SPRING TENSION
TOO STIFF
1. Slows machine down in loose snow.
2. Causes the snowmobile to dart and dive as a result
of less track on the ground on deceleration.
NOTE: A tight front arm works well under only
two conditions: sticky snow conditions in the
spring of the year and in hill climbing on hard
packed snow.
With the front arm adjusted too soft, the spring may
come off the roller.
REAR ARM SPRING TENSION
The rear spring tension is adjusted for the weight of
the driver. There are three possible adjustments.
1st block position - set for up to 150 lb
2nd block position - set for 150 to 200 lb
3rd block position - set for over 200 lb
727-720A
NOTE: When making any changes to the front
or rear suspension, the change should be made at
both ends to keep the suspension balanced. For
example, installing stiffer springs in front may
require installing the next step stiffer spring in
back to keep everything in balance.
ADJUSTING REAR ARM COUPLER
(Groove Style)
NOTE: The couplers are installed in the 2-
groove position at production.
The rear arm coupler provides advantages over the
standard suspension.
First, with the coupler system, ski lift under accelera-
tion is greatly reduced which provides improved han-
dling. Second, when riding through rough terrain, the
rear suspension arm receives some needed assistance
from the front arm shock and spring. This happens as
the rear arm is fully collapsed and locked up by the
coupler blocks. The front arm then starts to collapse
the shocks and spring which assist the rear springs.
The result is a smoother ride for the operator.
Each of the coupler blocks has four positions (notched
grooves on the outside surface of the block). When
changing the block position, change both to the same
groove number. To make coupler adjustment, follow
the procedure below.
! WARNING
Do not exceed 105 kg/cm
2
(150 psi) in the shock.