Yamaha FZ1-N Service Manual page 314

EAS26980
CHECKING THE INJECTORS
1. Check:
• Injectors
Damage → Replace.
EAS26990
CHECKING THE THROTTLE BODIES
1. Check:
• Throttle bodies
Cracks/damage → Replace the throttle
bodies as a set.
2. Check:
• Fuel passages
Obstructions → Clean.
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a. Wash the throttle bodies in a petroleum-
based solvent.
Do not use any caustic carburetor cleaning
solution.
b. Blow out all of the passages with com-
pressed air.
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ET2D1033
CHECKING THE FUEL PRESSURE
1. Check:
• Fuel pressure
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a. Remove the rider and passenger seat.
Refer to "GENERAL CHASSIS" on page 4-
1.
b. Disconnect the fuel hose (fuel tank to pri-
mary injector fuel rail) "1" from the primary
injector fuel rail.
EW2C01008
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 hoses.
c. Connect the pressure gauge "2" and
adapter "3" to the fuel hose (fuel tank to pri-
mary injector fuel rail).
Vacuum/pressure pump gauge
set
90890-06756
Pressure gauge
90890-03153
YU-03153
Fuel pressure adapter
90890-03176
YM-03176
d. Start the engine.
e. Measure the fuel pressure.
Fuel pressure
324 kPa (46.1 psi) (3.24 kg/
cm²)
Faulty → Replace the fuel pump.
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EAS27020
ADJUSTING THE THROTTLE POSITION
SENSOR
NOTE:
Before adjusting the throttle position sensor,
the engine idling speed should be properly
adjusted.
7-8
THROTTLE BODIES