Yamaha 2007 XP500 Service Manual page 110

should be properly adjusted and the ignition tim-
ing should be checked.
1. Stand the vehicle on a level surface.
NOTE:
Place the vehicle on a suitable stand.
2. Remove:
Seat
G
Refer to "GENERAL CHASSIS" on page 4-1.
Center cover
G
Side cover (left and right)
G
Refer to "GENERAL CHASSIS" on page 4-1.
3. Remove:
Synchronizing pipe caps "1"
G
4. Install:
Vacuum gauge "1"
G
(onto the synchronizing hose)
Digital tachometer
G
Vacuum gauge
90890-03094
Carburetor synchronizer
YU-44456
1
5. Start the engine and let it warm up for several
minutes.
6. Check:
Engine idling speed
G
Out of specification → Adjust.
Refer to "ADJUSTING THE ENGINE IDLING
SPEED" on page 3-8.
7. Adjust:
Throttle body synchronization
G
MMMMMMMMMMMMMMMMMMMMMM
a. Turn the throttle body #1 air screw "1", and #2
air screw "2". Using the carburetor angle driv-
er "3".
3
1
NOTE:
After each step, rev the engine two or three
G
times, each time for less than a second, and
check the synchronization again.
If the air screw is removed, turn the screw 3/4
G
turn in and be sure to synchronize the throttle
body.
ECA14900
CAUTION:
Do not use the throttle valve adjusting
screws to adjust the throttle body syncroni-
zation.
NOTE:
The difference in vacuum pressure between two
throttle bodies should not exceed 1.33 kPa (10
mm Hg).
LLLLLLLLLLLLLLLLLLLLLL
8. Measure:
Engine idling speed
G
3-6
Engine idling speed
1100–1300 r/min
2
Carburetor angle driver
90890-03158
Vacuum gauge
90890-03094
Carburetor synchronizer
YU-44456
Intake vacuum
33.0 kPa (9.7 inHg) (248 mmHg)
ENGINE
1