13
In-Line Fuel Filter
Yamaha recommends that the in-line fuel
filter be checked once a month. The filter
is located in the fuel hose between the gas
tank and carburetor. The only cleaning
possible is to back-flush the filter using
clean gasoline. To check, clean, or replace
the filter, use the following procedure:
1. Turn the gas tank shut-off valve to
the CLOSED position.
2. Remove and discard the clamps;
then pry the fuel hoses off the in-line
fuel filter and remove the filter.
3. Install the in-line fuel filter in the
fuel hose so the arrow on the filter
points toward the carburetor. Make
sure the fuel hoses fit tightly on the
filter. If a fuel hose does not fit
tightly, cut 6 mm (1/4 in.) from the
end of the fuel hose; then install on
the filter. Install new clamps.
4. Turn the gas tank shut-off valve to
the OPEN position.
Air Cleaner/Filter
The air filter inside the air cleaner housing
must be kept clean to provide good engine
power and gas mileage. If the snowmobile
is used under normal conditions, service
the filter at the intervals specified. If oper-
ated in adverse conditions, inspect and ser-
vice the filter more frequently. Use the
following procedure to remove the filter
and to inspect and/or clean it.
1. Remove the two screws securing the
air cleaner cover; then remove the
cover.
2. Remove the foam filter from the
housing.
3. Clean the foam filter in a non-flam-
mable cleaning solvent; then allow
the filter to dry.
NOTE: Foam Filter Cleaner and
Foam Filter Oil are available from
Yamaha.
4. Put the dry filter in a plastic bag;
then pour in recommended air filter
oil and work the oil into the filter.
5. Clean any debris from inside the air
cleaner. Be sure no debris enters the
carburetor.
6. Place the filter into the housing.
7. Place the air cleaner cover onto the
housing; then secure with the two
screws.
Spark Plug
This snowmobile comes equipped with a
specified spark plug. See the specifications
chart for the correct spark plug. A light
brown insulator indicates that the plug is
correct. A white or dark insulator indicates
that the engine may need to be serviced or
the carburetor may need to be adjusted.
Consult an authorized Yamaha Snowmo-
bile dealer if the plug insulator is not a light
brown color. To help prevent cold weather
fouling, make sure to thoroughly warm up
the engine before operating.
To maintain a hot, strong spark, keep the
plug free of carbon.
! WARNING
Whenever any maintenance or
inspection is made on a fuel system
when there may be fuel leakage,
there should be no welding, smok-
ing, open flames, etc., in the area.
CAUTION
The fuel hoses must fit tightly on the
fuel filter. If the fuel hose length
doesn’t permit this procedure, replace
the fuel hose. Also, after installing the
fuel hoses on the filter, check to be
sure that the fuel hoses do not con-
tact any hot or rotating components.
CAUTION
Failure to inspect the air filter frequently
if the snowmobile is used in adverse
conditions can damage the engine.
CAUTION
A torn air filter can cause damage to
the engine. Contaminants may get
inside the engine if the filter is torn.
Carefully examine the filter for tears
before and after cleaning it. Replace
the filter with a new one if it is torn.
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