Checking The Throttle Body Joint/Injector Pressure; Installing The Fuel Injectors - Yamaha YZF-R25 Service Manual

3. Adjust:
• Throttle bodies synchronizing
Out of specification → Replace the throttle
bodies.
Refer to "SYNCHRONIZING THE THROT-
TLE BODIES" on page 3-8.
EAS31317
CHECKING THE THROTTLE BODY JOINT
1. Check:
• Throttle body joint
Cracks/damage → Replace.
EAS31124

INSTALLING THE FUEL INJECTORS

ECA20000
NOTICE
• Always use new O-rings.
• When checking the injectors, do not allow
any foreign material to enter or adhere to
the injectors, fuel rail, or O-rings.
• Be careful not to twist or pinch the O-rings
when installing the injectors.
• If an injector is subject to strong shocks or
excessive force, replace it.
• If installing the original fuel rail and screws,
remove the white paint marks using a
cleaning solvent. Otherwise, paint chips on
the screw seats could prevent the screws
from being tightened to the specified
torque.
1. Install new seals onto the end of each injec-
tor.
2. Install the fuel injectors "1" to the fuel rail "2".
2
3. Install the fuel injector assemblies to the
throttle bodies.
Fuel rail bolt
3.5 Nm (0.35 m·kgf, 2.5 ft·lbf)
4. Check the injector pressure after the fuel in-
jectors are installed to the throttle bodies.
Refer to "CHECKING THE INJECTOR
PRESSURE" on page 7-11.
1
EAS30481
CHECKING THE INJECTOR PRESSURE
TIP
• After installing the fuel injectors, perform the
following 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 fuel rail "2", and then connect an air
compressor "3" to the adapter.
b. Connect the pressure gauge "4" to the fuel in-
jector pressure adapter "1".
Pressure gauge
90890-03153
Pressure gauge
YU-03153
Fuel injector pressure adapter
90890-03210
Fuel injector pressure adapter
YU-03210
c. Close the valve on the fuel injector pressure
adapter.
d. Apply air pressure with the air compressor.
e. Open the valve on the fuel injector pressure
adapter until the specified pressure is
reached.
Specific air pressure
490 kPa (4.9 kgf/cm
ECA18440
NOTICE
Never exceed the specified air pressure or
damage could occur.
f. Close the valve on the fuel injector pressure
adapter.
g. Check that the specified air pressure is held
for about one minute.
7-11
THROTTLE BODIES
▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼
2
, 69.7 psi)
▼ ▼▼▼ ▼ ▼▼▼