37
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
tension and the limiter straps are adjust-
able. However, Yamaha recommends that
the shock spring be maintained at the fac-
tory preset of 3.2-6.4 mm (1/8-1/4 in.)
preload. Tightening the skid frame front
arm shock spring may cause improper
balance and may ruin the handling fea-
tures of the snowmobile.
The length adjustment of the front arm
limiter straps determines the weight dis-
tribution 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 lim-
iter strap (lengthening the strap) lowers
the front of the skid frame and decreases
ski pressure.
When customizing the amount of ski
pressure, be sure to adjust both straps
equally and do not over-adjust the limiter
straps to adversely affect steering and
operator control of the snowmobile.
Some experimentation may be required
until the proper adjustment for the opera-
tor’s individual style is obtained.
NOTE: If the limiter straps are
adjusted, it is highly recommended
that at least a minimum of 3.2 mm (1/8
in.) preload on the shock spring be
maintained.
Adjusting Skid Frame Rear
Shock (Limited Models)
To adjust the damping, use the adjust-
ment lever located above the EVOL
chamber on the shock. There are three
settings that may be chosen: 1, 2, or 3.
SNO-550
Adjusting Rear Spring Pre-
Load
Proper adjustment of rear spring pre-load
is necessary to get the most desirable
ride. The chart is designed to help in set-
ting up rear spring pre-load; however,
riding style is the single greatest factor in
determining rear spring requirements.
NOTE: These cam position set-
tings are suggestions only. Per-
sonal riding style will greatly
influence cam position settings.
Spend time to determine setting
preferences.
WARNING
Do not adjust the front arm limiter
straps to a point at which steering
and operator control of the snow-
mobile are adversely affected.
Rider Weight (lb)
Cam
Position
Up to 80 kg (180 lb)
1
80 kg (180 lb) - 110 kg (240 lb)
2
Over 110 kg (240 lb)
3
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