7-10
THROTTLE BODY
EAS30769
CHECKING AND CLEANING THE THROTTLE
BODIES
Clean the throttle bodies only if they cannot be
synchronized using the bypass air screws. Be-
fore cleaning the throttle bodies, check the fol-
lowing items:
• Valve clearance
• Spark plug
• Air filter element
• Throttle body joint
• Fuel hose
• Exhaust system
• Cylinder head breather hose
EWA17340
If the throttle bodies are subjected to strong
shocks or dropped during cleaning, replace
them as a set.
1. Check:
• Throttle body
Cracks/damage Replace the throttle bod-
ies as a set.
2. Clean:
• Throttle body
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.
EWA15940
When cleaning the throttle bodies, be careful
not to injure yourself on the throttle valves or
other components of the throttle bodies.
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.
Recommended cleaning solvent
Yamaha Oil & Brake Cleaner
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