Cleaning The Spark Arrester - Yamaha BIG BEAR 400 Owner's Manual

9. Pull the sponge material over the air filter ele-
ment.
10. Insert the air filter element assembly into the
air filter case, and then install the air filter case
cover by hooking the holders onto the air filter
case.
11. Install the seat.
NOTE:
The air filter element should be cleaned every 20–
40 hours. It should be cleaned more often if the
ATV is operated in extremely dusty areas. Each
time the air filter element maintenance is per-
formed, check the air inlet of the air filter case for
obstructions. Check the air filter case rubber joint
to the carburetor fittings and the rubber joint mani-
fold fittings for an air-tight seal. Tighten all fittings
securely to avoid the possibility of unfiltered air en-
tering the engine.
ECB00460
CAUTION:
G Make sure that the air filter element is prop-
erly seated in the air filter case.
G
Never operate the engine with the air filter el-
ement 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 element
will affect carburetor jetting with subsequent
poor performance and possible engine over-
heating.
EBU23911

Cleaning the spark arrester

Select a well-ventilated area free of combustible
materials and make sure the exhaust pipe and
muffler are cool.
1. Remove the purging bolt.
1. Purging bolt
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8