Yamaha 2008 Fazer FZ1-N Service Manual page 128

2. Remove:
• Rider and passenger seat
Refer to "GENERAL CHASSIS" on page
4-1.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
3. Remove:
• Synchronizing hoses "1"
4. Install:
• Vacuum gauge "1"
(onto the synchronizing hose)
• Digital tachometer
(near the spark plug)
Vacuum gauge
90890-03094
Carburetor synchronizer
YU-44456
5. Install:
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
6. Start the engine and let it warm up for sev-
eral minutes.
7. Check:
• Engine idling speed
Out of specification → Adjust.
Refer to "ADJUSTING THE ENGINE
IDLING SPEED" on page 3-9.
Engine idling speed
1100–1300 r/min
8. Adjust:
• Throttle body synchronization
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a. With throttle body #3 as standard, adjust
throttle bodies #1, #2, and #4 using the air
screw "1".
NOTE:
• After each step, rev the engine two or three
times, each time for less than a second, and
check the synchronization again.
• If the air screw is removed, turn the screw 3/
4 turn in and be sure to synchronize the
throttle body.
ECA5D01027
CAUTION:
Do not use the throttle valve adjusting
screws to adjust the throttle body synchro-
nization.
Vacuum pressure at engine
idling speed
30 kPa (225 mmHg, 8.9 inHg)
NOTE:
The difference in vacuum pressure between
two throttle bodies should not exceed 1.33 kPa
(10 mmHg, 0.39 inHg).
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3-7
ENGINE