7-8
THROTTLE BODIES
EWA17340
If the throttle bodies are subjected to strong
shocks or dropped during cleaning, replace
them as a set.
1. Check:
• Throttle bodies
Cracks/damage → Replace the throttle bod-
ies as a set.
2. Clean:
• Throttle bodies
ECA21540
• Observe the following precautions; other-
wise, the throttle bodies may not operate
properly.
• Do not subject the throttle bodies to exces-
sive force.
• Clean the throttle bodies in the recom-
mended cleaning solvent.
• Do not use any caustic carburetor cleaning
solution.
• Do not apply cleaning solvent directly to
any plastic parts, sensors, or seals.
• Be careful not to remove the white paint
mark that identifies the standard throttle
body.
• Do not turn the bypass air screws “a”; oth-
erwise, the throttle body synchronization
will be affected.
a. Place the throttle bodies on a flat surface
with the air filter case side facing up.
b. Install the caps (895-14169-00) onto the
hose fittings “a”.
c. Hold the throttle valves in the open position.
WARNING
EWA15940
When cleaning the throttle bodies, be careful
not to injure yourself on the throttle valves or
other components of the throttle bodies.
NOTICE
ECA20380
• Do not open the throttle valves by supply-
ing electrical power to the throttle bodies.
• Do not use tools to open the throttle valves
or to keep them in the open position.
• Do not open the throttle valves quickly.
d. Apply the recommended cleaning solvent
to the throttle valves and the inside of the
throttle bodies to remove any carbon de-
posits.
• Do not allow any cleaning solvent to enter the
opening for the injectors.
• Do not apply any cleaning solvent to the por-
tions of the throttle valve shafts between the
throttle bodies.
e. Remove the carbon deposits from the in-
side of each throttle body in a downward di-
rection, from the air filter case side of the
throttle body to the engine side.
Recommended cleaning solvent
Yamaha Oil & Brake Cleaner
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