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Periodic maintenance
48
ESU11930
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 in-
jection system that delivers the optimal air/fu-
el ratio required by the engine. Therefore, the
fuel injection system does not need to be ad-
justed, even for operation at high altitude.
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.
CAUTION:
ECS00430
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.
ESU11950
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.
ESU12810
Engine oil and oil filter cartridge
The engine oil level should be checked before
each use. In addition, the oil must be changed
and the oil filter cartridge replaced at the inter-
vals specified in the periodic maintenance
and lubrication chart.
WARNING
EWS00370
Engine oil is extremely hot immediately af-
ter the engine is turned off. Coming into
contact with or getting any engine oil on
your clothes could result in burns.
CAUTION:
ECS00480
● Do not run the engine with too much or
not enough oil in the oil tank. Oil could
spray out or the engine could be dam-
aged.
● Be sure to change the engine oil after
the first 800 km (500 mi) of operation,
and every 4000 km (2500 mi) thereafter
or at the start of a new season, other-
wise the engine will wear quickly.
● The oil filter cartridge should be re-
placed every 20000 km (12000 mi) of op-
eration.
To check the engine oil level
1. Place the snowmobile on a level surface
and apply the parking brake.
U8GL10E0.book Page 48 Friday, May 18, 2007 3:17 PM