Yamaha YZF-R1 Series Service Manual page 425

b. Connect the pressure gauge "4" to the fuel
injector pressure adapter "1".
Pressure gauge
90890-03153
Pressure gauge
YU-03153
Fuel injector pressure adapter
90890-03210
Fuel injector pressure adapter
YU-03210
G089041
c. Close the valve on the injector pressure
adapter.
d. Apply air pressure with the air compres-
sor.
e. Open the valve on the injector pressure
adapter until the specified pressure is
reached.
Specified air pressure
490 kPa (5.0 kgf/cm², 71.1 psi)
ECA17600
NOTICE
Never exceed the specified air pressure or
damage could occur.
f. Close the valve on the injector pressure
adapter.
g. Check that the specified air pressure is
held at least one minute.
Pressure drops → Check the pressure
gauge and adapter.
Check the seals and O-rings and then re-
install.
Out of specification → Replace the fuel in-
jectors.
EAS30482
CHECKING THE FUEL PRESSURE
1. Remove:
• Rider seat
Refer to "GENERAL CHASSIS (1)" on page
4-1.
THROTTLE BODIES
• Fuel tank cover
Refer to "FUEL TANK" on page 7-1.
2. Check:
• Fuel pressure
a. Remove the fuel tank bolts and hold up the
fuel tank.
b. Disconnect the fuel hose "1" from the fuel
pump.
Refer to "FUEL TANK" on page 7-1.
EWA17320
WARNING
Cover fuel hose connections with a cloth
when disconnecting them. Residual pres-
sure in the fuel lines could cause fuel to
spurt out when removing the hose.
ECA17490
NOTICE
Be sure to disconnect the fuel hose by hand.
Do not forcefully disconnect the hose with
tools.
1
c. Connect the pressure gauge "2" and fuel
pressure adapter "3" to the fuel hose.
Pressure gauge
90890-03153
Pressure gauge
YU-03153
Fuel pressure adapter
90890-03176
Fuel pressure adapter
YM-03176
2
3
d. Start the engine.
7-18