Yamaha XVS950CU 2014 Service Manual page 167

4. Disconnect:
• Intake air pressure sensor hose "1"
• Cap "2"
5. Install:
• Hose "1" (Parts No.: 5JW-24311-00)
• 3-way joint "2" (Parts No.: 90413-05014)
• Vacuum gauge hose #1 "3"
• Vacuum gauge hose #2 "4"
• Intake air pressure sensor hose "5"
• Vacuum gauge "6"
• Digital tachometer
Vacuum gauge
90890-03094
Vacuummate
YU-44456
Digital tachometer
90890-06760
YU-39951-B
5
2
1
4
6. Install:
• Air filter case
Refer to "GENERAL CHASSIS" on page 4-1.
7. Adjust:
• Throttle body synchronization
▼ ▼▼▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼
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.
1
2
3 6
▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼
PERIODIC MAINTENANCE
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.
A
1
A
B
A. Front cylinder throttle body
B. Rear cylinder throttle body
TIP
• 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 was removed, turn the screw in
fully, and then turn it out 1 1/4 turns. Then, syn-
chronize the throttle bodies.
ECA14900
▼▼▼
NOTICE
Do not use the throttle valve adjusting
screws to adjust the throttle body synchroni-
zation.
3-8
B
1
Intake vacuum
34.7–40.0 kPa (260–300 mmHg,
10.2–11.8 inHg)
1
1