Yamaha RS90GTZ Service Manual page 40

THROTTLE BODY SYNCHRONIZATION
2-17
Adjustment steps:
• With throttle body #1 as standard, adjust
throttle body #2 and #3 using the synchroniz-
ing screws .
TIP
After each step, rev the engine two or three
times, each time for less than a second, and
check the synchronization again.
Vacuum pressure at engine idling
speed:
29.17 ~ 31.83 kPa (219 ~ 239
mmHg, 8.6 ~ 9.4 inHg)
TIP
The difference in vacuum pressure between
two throttle bodies should not exceed 1.3 kPa
(10 mmHg, 0.4 inHg).
6. Stop the engine and remove the measuring
equipment.
7. Adjust:
• Throttle cable free play
Refer to "THROTTLE CABLE FREE PLAY
ADJUSTMENT".
8. Install:
• Headlight stay
Refer to "THROTTLE BODY" in CHAPTER
7.
• Headlight assembly
Refer to "COWLINGS" in CHAPTER 3.
• Fuel tank cover
Refer to "FUEL TANK" in CHAPTER 5.
INSP
ADJ