Yamaha XVS13AWC Service Manual page 99

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:
• Throttle body synchronization
M MMM M MMM M M MMM M M MMM M
a. Measure the vacuum pressure of the front
cylinder throttle body and rear cylinder throt-
tle body.
b. Using the throttle body with the lowest vacu-
um pressure as the standard, turn the air
screw "1" of the other throttle body to adjust
its vacuum pressure.
c. If the vacuum pressure of the throttle body
with the lower pressure is out of specification,
adjust it to specification first, and then syn-
chronize the throttle bodies.
M MMM M M MMM M MMM
3-7
A
1
B
A
1
A. Front cylinder throttle body
B. Rear cylinder throttle body
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.
ECA14900
CAUTION:
Do not use the throttle valve adjusting
screws to adjust the throttle body synchroni-
zation.
Vacuum gauge
90890-03094
Carburetor synchronizer
YU-44456
ENGINE
1
B
1