Synchronizing The Throttle Bodies - Yamaha YZFR6X(C) 2008 Service Manual

EAS20570

SYNCHRONIZING THE THROTTLE BODIES

NOTE:
Prior to synchronizing the throttle bodies, the
valve clearance and the engine idling speed
should be properly adjusted.
1. Stand the vehicle on a level surface.
NOTE:
Place the vehicle on a suitable stand.
2. Remove:
• Rider seat
Refer to "GENERAL CHASSIS" on page
4-1.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
3. Remove:
• Caps "1"
1
4. Install:
• Vacuum gauge "1"
• Digital tachometer
Vacuum gauge
90890-03094
Carburetor synchronizer
YU-44456
1
5. Install:
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
6. Adjust:
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
Basic procedure
a. Start the engine, warm it up for several
b. Turn the bypass air screw "1" with a white
c. Using the throttle body that has the bypass
1
NOTE:
• If more than one throttle body has a bypass
• After each step, rev the engine two or three
• If an air screw was removed, turn the screw
NOTE:
• The difference in vacuum pressure between
3-7
• Throttle body synchronization
minutes, and then let it run at the specified
engine idling speed.
Engine idling speed
1250–1350 r/min
paint mark out a little, and then turn it in
fully.
1
air screw with a white paint mark as the
standard, turn the bypass air screws with-
out white paint marks in or out to the adjust
the other throttle bodies.
air screw with a white paint mark, use the
one with the lowest vacuum pressure as the
standard.
times, each time for less than a second, and
check the synchronization again.
3/4 turn in and be sure to synchronize the
throttle body.
Intake vacuum
20.0 kPa
mmHg)
two throttle bodies should not exceed 1.33
kPa (10 mmHg).
ENGINE
1
(5.9 inHg) (150