Yamaha V Star 950 Service Manual page 94

3. Remove:
• Rider seat
• Side cover (cylinder head)
Refer to "GENERAL CHASSIS" on page
4-1.
• Fuel tank
Refer to "FUEL TANK" on page 6-1.
4. Disconnect:
• Intake air pressure sensor hose "1"
• Cap "2"
5. Install:
• Vacuum gauge "1"
• Digital tachometer
Vacuum gauge
90890-03094
Carburetor synchronizer
YU-44456
Digital tachometer
90890-06760
YU-39951-B
6. Install:
• Fuel tank
Refer to "FUEL TANK" on page 6-1.
7. Adjust:
• Throttle body synchronization
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a. Adjust the boost with screw "1".
PERIODIC MAINTENANCE
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 a bypass air screw was removed, clean or
replace the throttle bodies.
ECA14900
Do not use the throttle valve adjusting
screws to adjust the throttle body synchro-
nization.
Engine idling speed
950–1050 r/min
b. Check the vacuum pressure.
The difference in vacuum pres-
sure between the throttle bod-
ies should not exceed 1.33 kPa
(10 mmHg).
If out of specification → Adjust the throttle
body synchronization.
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8. Stop the engine and remove the measuring
equipment.
3-9