Yamaha XVS950CU 2014, Service Manual

Page: 167 / 580

PERIODIC MAINTENANCE
3-8
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
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.
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.
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.
NOTICE
ECA14900
Do not use the throttle valve adjusting
screws to adjust the throttle body synchroni-
zation.
Vacuum gauge
90890-03094
Vacuummate
YU-44456
Digital tachometer
90890-06760
YU-39951-B
1
2
2
5
1
6
3
4
A. Front cylinder throttle body
B. Rear cylinder throttle body
Intake vacuum
34.7–40.0 kPa (260–300 mmHg,
10.2–11.8 inHg)
1
1
A B
1
A
1
B