Synchronizing The Throttle Bodies - Yamaha MTN1000 2016 Service Manual

EAS30797

SYNCHRONIZING THE THROTTLE BODIES

TIP
Before synchronizing the throttle bodies, check
the following items:
• Valve clearance
• Spark plugs
• Air filter element
• Throttle body joints
• Fuel hose
• Exhaust system
• Breather hoses
Checking the throttle body synchronization
1. Stand the vehicle on a level surface.
TIP
Place the vehicle on a maintenance stand.
2. Remove:
• Rider seat
• Air scoop/Air scoop stay
Refer to "GENERAL CHASSIS (1)" on page
4-1.
• Fuel tank cover
Refer to "GENERAL CHASSIS (2)" on page
4-13.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Air filter case
Refer to "GENERAL CHASSIS (3)" on page
4-20.
3. Remove:
• Caps "1"
4. Install:
• Vacuum gauge "1"
Vacuum gauge
90890-03094
Vacuummate
YU-44456
1
PERIODIC MAINTENANCE
5. Install:
• Air filter case
Refer to "GENERAL CHASSIS (3)" on page
4-20.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
6. Check:
• 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
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  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
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
3-10
1