Yamaha SR1NRJ Original Instructions Manual page 37

Adjusting Fox Air Shocks

NOTE: It is recommended to moni-
tor the air pressure in the air shocks
once every month.

NOTE: Adjusting air shocks may
be done by the snowmobile owner if
qualified to do so. If the owner does
not feel qualified, take the snowmo-
bile to an authorized Yamaha Snow-
mobile dealer for this service. This
service is at the discretion and
expense of the snowmobile owner.
The air shocks are individually adjustable
for the terrain conditions and driving style
of the operator. The shocks are preset at the
factory (see chart) as an initial setting;
however, it is possible to "fine tune" the
shocks to match the operator's weight, rid-
ing style, and terrain conditions.

NOTE: Adding air pressure will
increase the air spring force; reduc-
ing air pressure will decrease air
spring force.

NOTE: Shock Pressure should be
checked/added at room temperature
of 65 to 70 degrees. The following
settings are recommended but vary
on rider preference or style.
Initial Setting Chart
Front
Model Shock
(Ski)
Fox Float 3 100 psi
models

NOTE: Care should be taken to
have equal pressure in the front ski
shocks before operating the snow-
mobile.
To increase or decrease air pressure, use
the following procedure.
0745-159
Front Rear
Arm Arm
Shock Shock
N/A 130 psi

NOTE: When adjusting air pres-
sure, all weight must be removed
from the suspension, and the shock
absorbers must be fully extended.
1. Remove the air valve cap from the
shock.
2. Thread the valve of Shock Absorber
Air 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 pres-
sure of 0.14-0.35 kg/cm
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.
Adjusting Skid Frame
Front Arm Spring
The skid frame front arm shock spring ten-
sion and the limiter straps are adjustable.
However, Yamaha recommends that the
shock spring be maintained at the factory pre-
set of 3.2-6.4 mm (1/8-1/4 in.) preload. Tight-
ening the skid frame front arm shock spring
may cause improper balance and may ruin
the handling features of the snowmobile.
The length adjustment of the front arm
limiter straps determines the weight distri-
bution between the front of the skid frame
and the skis. Tightening the limiter strap
(shortening the strap) will pull up on the
front of the skid frame and will increase ski
pressure. Loosening the limiter strap
(lengthening the strap) lowers the front of
the skid frame and decreases ski pressure.
2
(2-5 psi).
35