YAMAHA BANSHEE 350 2010 Owners Manual

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WARNING

EWB02340
Do not start the engine when cleaning the
spark arrester, otherwise it could cause injury
to the eyes, burns, carbon monoxide poison-
ing, possibly leading to death, and start a fire.
Always let the exhaust system cool prior to
touching exhaust components.
EBU23993
Changing the 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.
WARNING

EWB01990

Improperly servicing or adjusting the carbu-
retors could cause them to malfunction with
the possibility of an accident, or the carbure-
tors could leak fuel, which would be a fire
hazard.

Carburetor adjustments should only be per-
formed by a Yamaha dealer. Do not attempt
to perform these procedures unless you
have mechanical knowledge and the neces-sary tools.

Do not perform this procedure while the en-
gine is hot. Place a rag under each carbure-
tor to catch any fuel. Wipe up any spilled fuel
completely.

After servicing the carburetors, always
check the throttle lever operation before op-
erating the ATV to make sure it is working
correctly.
Standard settings

Main jet #200
Jet needle clip position 3rd groove
Pilot air screw 2.0 turns out
1. Main jet number
1
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1. Standard position: Groove 3
1
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Carburetor setting chart
Changing the settings of the carburetors
To change the settings of the carburetors, you
need to disassemble and remove them. Follow the
procedures for both carburetors.
Disassembling and removing the carburetors
1. Turn the fuel cock to the “OFF” position.
2. Turn out the carburetor drain screw to drain
the fuel.
3. Remove the seat.
4. Remove the radiator cover and side cover by
removing the screws.
5. Disconnect the fuel hoses.

TemperatureAltitude
0
–1500 m (5000 ft) Above 1500 m (5000 ft)
Main jet Jet needle Pilot air screw Main jet Jet needle Pilot air screw

Above 0 °C (32 °F) #200 3rd groove 2.0 turns out #190 3rd groove 2 1/2 turns out
from +5 °C (41 °F) to
–15 °C (5 °F)#220 3rd groove 1 1/2 turns out #200 3rd groove 2.0 turns out
from –10 °C (14 °F) to
–30 °C (–22 °F)#240 4th groove 1 1/2 turns out #220 3rd groove 1 1/2 turns out
1. Radiator cover
2. Side cover
3. Screw
1
2 3 3
3
3
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6. Remove the fuel tank by removing the bolts.
7. Remove the air filter case cover by unhooking
the holders.8. Remove the mixing chamber cap securing
plate by removing the screw.
1. Fuel tank
2. Bolt
1
2
22
2

1. Air filter case cover
2. Air filter case cover holder
1 2 2
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9. Loosen the carburetor joint screws.10. Remove the mixing chamber cap.
11. Remove the throttle cable from the throttle
valve, and then remove the throttle cable hold-
er by removing the screws.
1. Mixing chamber cap securing plate
2. Screw
21

1. Joint screw
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1
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12. Remove the carburetor, and then remove the
float chamber by removing the screws.
1. Throttle cable
2. Throttle valve
3. Throttle cable holder
4. Screw
1
2
3 4

1. Float chamber
2. Screw
1
2 2
2
2
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13. Remove the float and needle valve.
14. Change the main jet and the jet needle clip po-
sition.
TIP


Optional main jets can be obtained at a Yamaha
dealer.

After the jet needle clip position is changed, the
throttle cables may need to be adjusted.Assembling and installing the carburetors
Assemble and install both carburetors by the fol-
lowing steps.
1. Install the needle valve and float.
2. Install the float chamber by installing the
screws.
3. Install the carburetor and tighten the joint
screws.
4. Assemble the throttle valve.
5. Install the mixing chamber cap, and then tight-
en it securely to the specified torque.
6. Install the mixing chamber cap securing plate
by installing the screw.
NOTICE:
Be sure to
match one of the projections on the carbu-
retor cap with one of the slots on the se-
curing plate. If the securing plate does not
match a projection, tighten the carburetor
cap until they align. Do not loosen the car-
buretor cap.

[ECB00502]

1. Float
2. Needle valve
3. Main jet
1
2 3

Tightening torque:
Mixing chamber cap:
4 Nm (0.4 m·kgf, 2.9 ft·lbf)
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7. Tighten the mixing chamber cap securing
plate screw to the specified torque.
8. Tighten the carburetor joint screws.
Adjusting the throttle cables
1. Move the throttle lever a few times.
2. Push the throttle lever forward until it stops
and hold it in this position.
3. Check through each carburetor window to see
if the punch mark on the throttle valve is at the
specified position.
4. If not, loosen the locknut and turn the adjust-
ing nut until the specified position is obtained.
1. Mixing chamber cap securing plate
2. Projection
3. Slot
4. Screw
Tightening torque:
Mixing chamber cap securing plate screw:
3.5 Nm (0.35 m·kgf, 2.5 ft·lbf)
12
3
4

1. Punch mark
2. Specified position: 0–1mm
1
2
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5. Move the throttle lever a few times and re-
check the position.
6. Install the fuel tank, side cover, radiator cover
and air filter case cover.
7. Connect the fuel hoses.
8. Install the seat.
EBU24020
Adjusting the engine idling speed
The engine idling speed must be checked and, if
necessary, adjusted as follows at the intervals
specified in the periodic maintenance and lubrica-tion chart.TIP


A diagnostic tachometer is needed to make this
adjustment.

The carburetor synchronization and the throttle
cable free play must be checked, and adjusted if
necessary, before adjusting the engine idling
speed.
1. Start the engine and warm it up.
TIP

The engine is warm when it quickly responds to the
throttle.
2. Attach the tachometer to the spark plug lead.
3. Turn in both pilot air screws until they lightly
seat.
4. Turn out both pilot air screws to specification.
(See the “Changing the carburetor settings”
section on the page 8-23.)
1. Adjusting nut
2. Locknut
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5. Remove the seat. (See page 4-11.)
6. Check the engine idling speed and, if neces-
sary, adjust it to specification by turning the
throttle stop screws at the carburetors. To in-
crease the engine idling speed, turn the throt-
tle stop screws in direction (a), and to
decrease it, turn the screws in direction (b).NOTICE
ECB00510

The throttle stop screws were preset at the
factory. When adjusting the idling speed,
turn both throttle stop screws the same
amount, otherwise the carburetor synchroni-
zation will be incorrect.

Adjusting the pilot air screws and the idling
speed are separate procedures, but they
must be adjusted at the same time to achieve
1. Pilot air screw
1

1. Throttle stop screw
Engine idling speed:
1450–1550 r/min
1
(b)
(a)
(a)
(b)
✦✯✬✩✧✤✲✣ ✦✥