Replacing The Throttle Bodies; Installing The Injectors - Yamaha MT-09 2021 Service Manual

ECA17590
NOTICE
• Do not use a tool, such as a wire brush, to
remove the carbon deposits; otherwise, the
inside of the throttle bodies may be dam-
aged.
• Do not allow carbon deposits or other for-
eign materials to enter any of the passages
in each throttle body or in the space be-
tween the throttle valve shaft and the throt-
tle body.
f. After removing the carbon deposits, clean
the inside of the throttle bodies with the rec-
ommended cleaning solvent, and then dry
the throttle bodies using compressed air.
g. Make sure that there are no carbon depos-
its or other foreign materials in any of the
passages "a" in each throttle body or in the
space "b" between the throttle valve shaft
and the throttle body.
A
a
b
A. Air filter case side
B. Throttle body joint side
3. Install the throttle bodies.
4. Reset:
• ISC (idle speed control) learning values
Use the diagnostic code number "67".
Refer to "DIAGNOSTIC CODE: SENSOR
OPERATION TABLE" on page 9-76.
5. Adjust:
• Throttle bodies synchronizing
Out of specification → Replace the throttle
bodies.
Refer to "SYNCHRONIZING THE THROT-
TLE BODIES" on page 3-8.
B
a
EAS31160

REPLACING THE THROTTLE BODIES

1. Remove the throttle bodies from the vehicle.
2. Install a new throttle bodies to the vehicle.
3. Reset:
• ISC (idle speed control) learning values
Use the diagnostic code number "67".
Refer to "DIAGNOSTIC CODE: SENSOR
OPERATION TABLE" on page 9-76.
• A/F control learning value
Use the diagnostic code number "87".
Refer to "DIAGNOSTIC CODE: SENSOR
OPERATION TABLE" on page 9-76.
4. Adjust:
• Throttle bodies synchronizing
Refer to "SYNCHRONIZING THE THROT-
TLE BODIES" on page 3-8.
5. Place the vehicle on a maintenance stand so
that the rear wheel is elevated.
6. Check:
• Engine idling speed
Start the engine, warm it up, and then mea-
sure the engine idling speed.
Engine idling speed
1200–1400 r/min
EAS30480

INSTALLING THE INJECTORS

ECA19400
NOTICE
• Always use new O-rings.
• When installing the injectors, do not allow
any foreign material to enter or adhere to
the injectors, fuel rails, or O-rings.
• Be careful not to twist or pinch the O-rings
when installing the injectors.
• When installing the injector, install it at the
same position as the removed cylinder.
• If an injector is subject to strong shocks or
excessive force, replace it.
1. Install a new seal onto the end of each injec-
tor.
2. Install the injectors to the fuel rail, making
sure to install them in the correct direction.
3. Install the injector assemblies to the throttle
bodies.
Fuel rail bolt
3.5 N·m (0.35 kgf·m, 2.6 lb·ft)
7-9
THROTTLE BODIES