Adjusting The Throttle Body Synchronization - Yamaha TMAX XP530E-A 2017 Service Manual

4. Install:
• Hose "1"
(Parts No.: 5JW-24311-00)
• 3-way joint "2"
(Parts No.: 68V-24376-00)
• Intake air pressure sensor hose "3"
• Vacuum gauge "4"
Vacuum gauge
90890-03094
Vacuummate
YU-44456
1
5. Install:
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
6. Check:
• Throttle body synchronization
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a. Start the engine, warm it up for several min-
utes, and then let it run at the specified en-
gine idling speed.
Engine idling speed
1100–1300 r/min
b. Check the vacuum pressure.
Difference in vacuum pressure
between the cylinders
0 kPa–1.3 kPa (0 mmHg–10
mmHg, 0 inHg–0.4 inHg)
4
3
TIP
2
3-10
PERIODIC MAINTENANCE
If out of specification  Adjust the throttle
body synchronization.
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Adjusting the throttle body synchronization

1. Adjust:
• Throttle body synchronization
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Start the engine, warm it up for several min-
utes, and then let it run at the specified en-
gine idling speed.
Engine idling speed
1100–1300 r/min
b. Using the throttle body that has the bypass air
screw "1" with a white paint mark as the stan-
dard, adjust the other throttle bodies by turn-
ing its bypass air screw in or out.
ECA21300
NOTICE
Do not turn the bypass air screw (white paint
mark) of the throttle body that is the stan-
dard. Otherwise, the engine may run roughly
at idle and the throttle bodies may not oper-
ate properly.
• Turn the bypass air screw using the carburetor
angle driver.
• 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, turn the
screw in fully and be sure to synchronize the
throttle bodies.
• If the throttle body synchronization can not be
adjusted using the bypass air screw, clean or
replace the throttle bodies.
• The difference in vacuum pressure between
the throttle bodies should not exceed 1.33 kPa
(10 mmHg).
Carburetor angle driver 2
90890-03173