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Adjusting Skid Frame Front Arm
Spring
The skid frame front arm shock spring
ten- sion 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.
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.
Adjusting Skid Frame Rear
Shock (Fox QS3)
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.
39
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.
Rider Weight (lb)
Up to 80 kg (180 lb)
80 kg (180 lb) - 110 kg (240 lb)
Over 110 kg (240 lb)
NOTE: These cam position set-
tings are suggestions only. Personal
riding style will greatly influence
cam position settings. Spend time
to determine setting preferences.
Rear spring pre-load adjustment is
accomplished by rotating the adjusting
cams. Position 3 provides the stiffest ride,
and position 1 is for the light driver or
slow-speed trail riding. Position 2 is for
the average operator under normal condi-
tions. Always rotate the cam from the
lighter position to the heavier position.
CAUTION
Never force the adjustment cams
from the low position to the high
position. Cam damage may occur.
Position 3
SNO-550
Cam
Position
1
2
3
Position 2
Position 1
Adjusting Cam
SNO-595
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