2003 Yamaha Motorsports Big Bear 400 4x4 Owners Manual - Page 128

2003 Yamaha Motorsports Big Bear 400 4x4 Manual

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Page 128 highlights

EBU00754 NOTE: The air filter element should be cleaned every 20-40 hours. It should be cleaned more often if the machine is operated in extremely dusty areas. Each time filter element maintenance is performed, check the air inlet to the filter case for obstructions. Check the air cleaner rubber joint to the carburetor and manifold fittings for an airtight seal. Tighten all fittings securely to avoid the possibility of unfiltered air entering the engine. Spark arrester cleaning Select a well-ventilated area free of combustible materials and make sure the exhaust pipe and muffler are cool. 1. Remove the purging bolt. CAUTION: Never operate the engine with the air filter element removed. This will allow unfiltered air to enter, causing rapid engine wear and possible engine damage. Additionally, operation without the filter element will affect carburetor jetting with subsequent poor performance and possible engine overheating. 8-17 1. Purging bolt (× 1) 2. Start the engine and rev it up approximately twenty times while momentarily creating exhaust system back pressure by blocking the end of the muffler with a shop towel. 3. Stop the engine and allow the exhaust pipe to cool. 4. Install the purging bolt and tighten it.

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8-17
NOTE:
The air filter element should be cleaned every
20–40 hours. It should be cleaned more often
if the machine is operated in extremely dusty
areas. Each time filter element maintenance
is performed, check the air inlet to the filter
case for obstructions. Check the air cleaner
rubber joint to the carburetor and manifold fit-
tings for an airtight seal. Tighten all fittings se-
curely to avoid the possibility of unfiltered air
entering the engine.
CAUTION:
Never operate the engine with the air filter
element removed. This will allow unfiltered
air to enter, causing rapid engine wear and
possible engine damage. Additionally, op-
eration without the filter element will affect
carburetor jetting with subsequent poor
performance and possible engine over-
heating.
EBU00754
Spark arrester cleaning
Select a well-ventilated area free of combusti-
ble materials and make sure the exhaust pipe
and muffler are cool.
1.
Remove the purging bolt.
1.
Purging bolt (
×
1)
2.
Start the engine and rev it up approxi-
mately twenty times while momentarily
creating exhaust system back pressure
by blocking the end of the muffler with a
shop towel.
3.
Stop the engine and allow the exhaust
pipe to cool.
4.
Install the purging bolt and tighten it.