2008 YAMAHA BANSHEE 350 Owners Manual

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touching exhaust components.
EBU23992
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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Carburetor setting chart
1. Standard position: Groove 3
1

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

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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.
6. Remove the fuel tank by removing the bolts.
7. Remove the air filter case cover by unhooking
the holders.

1. Radiator cover
2. Fuel tank
3. Screw
1
2 3 3
3
3

1. Fuel tank
2. Bolt
2
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2
22

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8. Remove the mixing chamber cap securing
plate by removing the screw.9. Loosen the carburetor joint screws.
1. Air filter case cover
2. Air filter case cover holder
1 2 2

1. Mixing chamber cap securing plate
2. Screw
21

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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. Joint screw
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1

1. Throttle cable
2. Throttle valve
3. Throttle cable holder
4. Screw
1
2
3 4

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12. Remove the carburetor, and then remove the
float chamber by removing the screws.13. Remove the float and needle valve.
14. Change the main jet and the jet needle clip po-
sition.NOTE:

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.
1. Float chamber
2. Screw
1
2 2
2
2

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

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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.CAUTION:

ECB00501
Be sure to match one of the projections on the
carburetor 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 carburetor
cap.
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. Tightening torque:
Mixing chamber cap:
4 Nm (0.4 m·kgf, 2.9 ft·lbf)

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

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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.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-
1. Punch mark
2. Specified position: 0–1mm
1
2

1. Adjusting nut
2. Locknut
1
2