Adjusting The Throttle Body Synchronization - Yamaha R1 Series 2015 Service Manual

5. Install:
• Air filter case
Refer to "AIR FILTER CASE" on page 7-4.
• 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
1200–1400 r/min
b. Check the vacuum pressure.
The difference in vacuum pres-
sure between the throttle bodies
should not exceed 1.33 kPa (10
mmHg).
If out of specification
body synchronization.
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Adjusting the throttle body synchronization

1. Adjust:
• 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
1200–1400 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
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Adjust the throttle
3-10
PERIODIC MAINTENANCE
at idle and the throttle bodies may not oper-
ate properly.
TIP
• 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
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2. Stop the engine and remove the measuring
equipment.
3. Install:
• Caps
4. Install:
• Air filter case
Refer to "AIR FILTER CASE" on page 7-4.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Fuel tank cover
Refer to "GENERAL CHASSIS (2)" on page
4-7.
• Rider seat
Refer to "GENERAL CHASSIS (1)" on page
4-1.
5. Adjust:
• Throttle grip free play
Refer to "CHECKING THE THROTTLE
GRIP" on page 3-36.
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