4
After 800 km (500 miles) of operating,
the engine oil must changed and the oil
filter replaced. The engine oil should be
changed every 4000 km (2500 miles)
before prolonged storage and the oil filter
should be changed every 20,000 km
(12,500 miles).
Filling Gas Tank
Since gasoline expands as its temperature
increases, the gas tank must be filled to
its rated capacity only. Expansion room
must be maintained in the tank particu-
larly if the tank is filled with cold gaso-
line and then moved to a warm area.
Also, if the snowmobile is to remain on a
trailer after filling the gas tank, the bed of
the trailer must be maintained level to
prevent gasoline from draining out
through the gas tank vent hose.
This snowmobile features a 15.9 L
(4.2 US gallon) auxiliary gas tank. A sep-
arate gas tank cap is located beneath the
cowling just behind the operator seat.
The auxiliary tank is plumbed directly
into the main gas tank.
YM-126
To access the spare belt location along
with the tool kit, the storage box lid, aux-
iliary gas tank cap, and storage tray must
be removed.
When installing the storage tray, ensure it
is properly pushed all the way down into
position. If not, the storage box lid will
not sit properly.
Engine Break-In
The engine (when new or rebuilt)
requires a short break-in period before
the engine is subjected to heavy load con-
ditions.
This engine does not require any pre-
mixed fuel during the break-in period.
There is never a more important period in
the life of the engine than the first 500
km (300 miles).
Since the engine is brand new, do not put
an excessive load on it for the first 500
km (300 miles). The various parts in the
engine wear and polish themselves to the
correct operating clearances. During this
period, prolonged full throttle operation
or any condition that might result in
engine overheating must be avoided.
0-160 km (0–100 miles): Avoid pro-
longed operation above 6000 RPM.
160-500 km (100–300 miles): Avoid pro-
longed operation above 8000 RPM.
500 km (300 miles) and beyond: The
snowmobile can now be operated nor-
mally.
NOTE: After 800 km (500 miles) of
operation, the engine oil must be
changed and the oil filter replaced.
If any engine trouble should occur
during the engine break-in period,
immediately have a Yamaha dealer
check the snowmobile.
Drive Belt Break-In
Drive belts require a break-in period of 40
km (25 miles). Drive the snowmobile for
40 km (25 miles) at 3/4 throttle or less. By
revving the engine up and down (but not
exceeding 100 km/h [60 mph]), the
exposed cord on the side of a new belt will
be worn down. This will allow the drive
belt to gain its optimum flexibility and
will extend drive belt life.
WARNING
Always fill the gas tank in a well-ven-
tilated area. Never add gasoline to
the snowmobile gas tank near any
open flames or with the engine run-
ning. DO NOT SMOKE while filling
the gas tank. Do not sit on the snow-
mobile without first installing the gas
tank cap.
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