Yamaha YFM90RA Owner's Manual page 91

6. Apply Yamaha foam air filter oil or other qual-
ity foam air filter oil to the sponge materials.
TIP
The sponge materials should be wet but not drip-
ping.
7. Install the sponge materials onto the air filter
element holders.
8. Place the air filter elements in the original po-
sition, and then install the screws.
9. Install the air filter case covers by installing the
bolts.
TIP
The air filter elements should be cleaned every 20–
40 hours. They should be cleaned and lubricated more
often if the ATV is operated in extremely dusty ar-
eas. Each time the air filter elements maintenance
is performed, check the air inlet of the air filter cases
for obstructions.
NOTICE
Make sure that the air filter elements are prop-
erly seated in their air filter case.
Never operate the engine with the air filter el-
ements removed. This will allow unfiltered air
to enter the engine, causing rapid engine
wear and possible engine damage. Addition-
ally, operation without the air filter elements
will affect carburetor jetting with subsequent
poor performance and possible engine over-
heating.
This model is equipped with two air filter
elements: one located on the left side and one
located on the right side of the air box.
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