Yamaha FZ8-NA, Service Manual

Page: 384 / 610

THROTTLE BODIES
7-11
f. After removing the carbon deposits, clean
the inside of the throttle bodies with a
petroleum-based solvent, and then dry the
throttle bodies using compressed air.
g. Make sure that there are no carbon depos-
its or other foreign materials in any of the
passages “a” in each throttle body, in the
space “b” between the throttle valve shaft
and the throttle body or in the space “c”
between the sub throttle valve shaft and the
throttle body.
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3. Check:
• Fuel passages
Obstructions
→
Clean.
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a. Wash the throttle bodies in a petroleum-
based solvent.
ECA2S31070
Do not use any caustic carburetor cleaning
solution.
b. Blow out all of the passages with com-
pressed air.
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4. Adjust:
• Throttle bodies synchronizing
Out of specification
→
Replace the throt-
tle bodies.
Refer to “SYNCHRONIZING THE
THROTTLE BODIES” on page 3-9.
EAS39P1711
INSTALLING THE FUEL HOSE (THROTTLE
BODY SIDE)
1. Connect:
• Fuel hose (throttle body side)
ECA14B1033
When installing the fuel hose, make sure
that it is securely connected, and that the
fuel hose connector cover on the fuel hose
is in the correct position, otherwise the fuel
hose will not be properly installed.
TIP
• Install the fuel hose securely onto the fuel rail
joint until a distinct “click” is heard.
• To install the fuel hose onto the fuel rail joint,
slide the fuel hose connector cover “1” on the
end of the hose in the direction of the arrow
shown.
• It is prohibited to wear the cotton work gloves
or equivalent coverings.
EAS39P1707
ADJUSTING THE THROTTLE POSITION
SENSOR
WARNING
EWA14B1023
• Handle the throttle position sensor with
special care.
• Never subject the throttle position sensor
to strong shocks. If the throttle position
sensor is dropped, replace it.
1. Check:
• Throttle position sensor
Refer to “CHECKING THE THROTTLE
POSITION SENSOR” on page 8-199.
2. Adjust:
• Throttle position sensor angle
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a. Temporary tighten the throttle position sen-
sor.
b. Check that the throttle grip is fully closed.