Yamaha YZF-R1 2020 Service Manual page 423

Refer to "SELF-DIAGNOSTIC FUNCTION
AND DIAGNOSTIC CODE TABLE" on page
9-40.
6. Reset:
• A/F control learning value
Use the DTC number "87".
Refer to "SELF-DIAGNOSTIC FUNCTION
AND DIAGNOSTIC CODE TABLE" on page
9-40.
7. Adjust:
• Throttle bodies synchronizing
Out of specification → Replace the throttle
bodies.
Refer to "SYNCHRONIZING THE THROT-
TLE BODIES" on page 3-9.
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 "SELF-DIAGNOSTIC FUNCTION
AND DIAGNOSTIC CODE TABLE" on page
9-40.
4. Reset:
• A/F control learning value
Use the diagnostic code number "87".
Refer to "SELF-DIAGNOSTIC FUNCTION
AND DIAGNOSTIC CODE TABLE" on page
9-40.
5. Adjust:
• Throttle bodies synchronizing
Refer to "SYNCHRONIZING THE THROT-
TLE BODIES" on page 3-9.
6. Place the vehicle on a maintenance stand so
that the rear wheel is elevated.
7. 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
EAS31669
INSTALLING THE PRIMARY INJECTORS
ECA21550
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.
• If installing the original fuel rail and bolts,
remove the white paint marks using a
cleaning solvent. Otherwise, paint chips on
the bolt seats could prevent the bolts from
being tightened to the specified torque.
1. Install primary injector joint "1" so that damper
part "a" faces the rib "b" side of fuel rail "2" as
shown in the illustration.
1,a
2
2. Install a new seal onto the end of each injec-
tor.
3. Install the injectors to the fuel rails.
4. Install the primary injector joint, making sure
to install them in the correct direction.
5. Install the injector assemblies to the throttle
bodies.
Fuel rail screw (throttle body)
3.5 N·m (0.35 kgf·m, 2.6 lb·ft)
6. Check the injector pressure after the injectors
are installed.
Refer to "CHECKING THE INJECTOR
PRESSURE" on page 7-16.
EAS30481
CHECKING THE INJECTOR PRESSURE
TIP
• After installing the injectors, perform the follow-
ing steps to check the injector pressure.
• Do not allow any foreign materials to enter the
fuel lines.
1. Check:
• Injector pressure
a. Connect the fuel injector pressure adapter
"1" to the injector joint "2", and then con-
nect an air compressor "3" to the adapter.
7-16
THROTTLE BODIES
b
2