Periodic maintenance and adjustment
57
8.
Install the headlight unit, making sure to
fit the slots on its bottom onto the projec-
tions on its stay.
9.
Fit the weatherstrip on the headlight unit
into the recess in the top of the air filter
case cover.
10. Install the headlight unit bolts and wind-
shield stay bolts, and then tighten them
to their specified torques.
11. Install the top cover, the left and right
side covers, and the shroud.
ESU11932
High-altitude settings
Operating at high altitude reduces the perfor-
mance of a gasoline engine about 3% for ev-
ery 305 m (1000 ft) of elevation. This is
because there is less air as altitude increases.
Less air means less oxygen available for
combustion.
Your snowmobile utilizes an electronic fuel
injection system that delivers the optimal
air/fuel ratio required by the engine. There-
fore, the fuel injection system does not need
to be adjusted, even for operation at high al-
titude.
Remember:
Less air at higher altitude means there is less
horsepower available, even with the optimal
air/fuel ratio. Expect acceleration and top
speed to be reduced at higher altitudes.
To overcome operating with less power at
high altitudes, your snowmobile may also re-
quire different settings for the drive chain
gears and V-belt clutch to avoid poor perfor-
mance and rapid wear. If you plan to operate
your snowmobile at an altitude different from
the area where you bought it, be sure to con-
sult a Yamaha dealer. The dealer can tell you
if there are any changes necessary for the al-
titude where you plan to ride.
NOTICE:
The
drive chain gears and V-belt clutch should
be adjusted when operating above a high
altitude of 900 m (3000 ft). Consult a
Yamaha dealer.
[ECS00432]
ESU11951
Valve clearance
The valve clearance changes with use, result-
ing in improper air-fuel mixture and/or engine
noise. To prevent this from occurring, the
valve clearance must be adjusted by a
Yamaha dealer at the intervals specified in
the periodic maintenance chart.
1. Slot
2. Projection
1. Weatherstrip
Tightening torques:
Headlight unit bolt:
3.0 Nm (0.30 m·kgf, 2.2 ft·lbf)
Windshield stay bolt:
14 Nm (1.4 m·kgf, 10 ft·lbf)
1
2
1
U8HXS3E0.book Page 57 Wednesday, April 2, 2014 2:44 PM
