2006 YAMAHA BANSHEE 350 engine

8-35
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Hard water or salt water is harmful to the
engine. You may use soft water if you can’t
get distilled water.
11. Install the radiator cap.Recommended antifreeze:
High quality ethylene glycol antifreeze
containing corrosion inhibitors for
aluminum engines.
Antifreeze and water mixing ratio:
1:1
Total amount:
1.5 L
Coolant reservoir capacity:
0.28 L

8-37
12. Run the engine several minutes. Stop the
engine, and then check the coolant level in
the radiator. If it is low, add more coolant
until it reaches the top of the radiator.
13. Fill the coolant reservoir with coolant up to
the maximum level.
14. Install the coolant reservoir cap and check
for coolant leakage.
NOTE:
If any leakage is found, ask a Yamaha dealer to
inspect the cooling system.
15. Install the radiator cover by installing the
bolts.

8-39
EBU00287
Spark plug inspection
The spark plugs are important engine compo-
nents and are easy to inspect. The condition of
the spark plugs can indicate the condition of the
engine.
Normally, all spark plugs from the same engine
should have the same color on the white porce-
lain insulator around the center electrode. The
ideal color at this point is a medium to light tan
color for a machine that is being ridden normal-
ly. If one spark plug shows a distinctly different
color, there could be something wrong with the
engine.
Do not attempt to diagnose such problems your-
self. Instead, take the machine to a Yamaha
dealer. You should periodically remove and
inspect the spark plugs because heat and
deposits will cause any spark plug to slowly
break down and erode. If electrode erosion
becomes excessive, or if carbon and other
deposits are excessive, you should replace the
spark plug with the specified plug.

2
2
11
3
1. Air filter element 2. Element frame
3. Lock plate
1. Elément du filtre à air 2. Armature du elément
3. Plaquette de fixation
1. Elemento filtrante de aire 2. Marco de elemento
3. Placa de cierre
8-45
3. Remove the air filter element assembly,
and then remove the air filter element from
its frame by turning the lock plate.
4. Wash the element gently but thoroughly in
solvent.
w
Always use parts cleaning solvent to clean
the air filter element. Never use low flash
point solvents or gasoline to clean the air fil-
ter element because the engine could catch
fire or explode.
5. Squeeze the excess solvent out of the air
filter element and let it dry.
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Do not twist the air filter element when
squeezing it.

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NOTE:
The air filter element should be cleaned every
20-40 hours. It should be cleaned and lubricated
more often if the machine is operated in
extremely dusty areas. Each time the air filter
element maintenance is performed, check the
air inlet to the filter case for obstructions. Check
the air filter case 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.
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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, opera-
tion without the air filter element will affect
carburetor jetting with subsequent poor per-
formance and possible engine overheating.

8-51
EBU03004
Carburetor settings
In extremely cold weather, it is necessary to
change the carburetor settings to maintain opti-
mum engine performance and to prevent engine
damage.
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8Improperly servicing or adjusting the car-
buretors could cause malfunction with the
possibility of an accident or the carbure-
tors could leak fuel, which would be a fire
hazard.
8Carburetor adjustments should only be
performed by a Yamaha dealer. Do not
attempt to perform these procedures
unless you have mechanical knowledge
and the necessary tools.
8Do not perform this procedure while the
engine is hot. Place a rag under each car-
buretor to catch any fuel. Wipe up any
spilled fuel completely.
8After servicing the carburetors, always
check throttle operation before operating
the ATV to make sure it is working correctly.

8-67
EBU03021
Idle speed adjustment
NOTE:
A diagnostic tachometer must be used for this
procedure.
NOTE:
The throttle cables and carburetor synchroniza-
tion must be set properly before adjusting the
idle speed.
1. Adjust the pilot air screws.
8Turn in both pilot air screws until they
lightly seat.
8Turn out both pilot air screws to specifi-
cation. (Refer to the “Carburetor settings”
section.)
2. Remove the seat.
3. Start the engine and warm it up for a few
minutes at approximately 1,000 to 2,000
r/min.
q
1. Pilot air screw
1. Vis d’air de ralenti
1. Tornillo de aire piloto

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4. Connect the tachometer and set the idle to
the specified idling speed by turning the
idle adjust screws.Turn the screws in to
directionato increase the engine speed,
and out in direction bto decrease the
engine speed.
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8Idle speed adjust screws were preset at
the factory. When adjusting idle speed,
turn the right and left idle speed adjust
screws the same amount, or carburetor
synchronization will be incorrect.
8The pilot air screws and idle speed adjust
screws are separate adjustments but they
must be adjusted at the same time to
achieve optimum engine performance.
1
baab
1. Idle speed adjust screw
1. Vis de réglage du régime de ralenti
1. Tornillo de ajuste de la velocidad de ralentí
Specified idle speed:
1,450–1,550 r/min