Checking The Injectors; Checking The Throttle Bodies; Checking The Fuel Pressure; Adjusting The Throttle Position Sensor (For Throttle Valves) - Yamaha YZFR1W 2007 Service Manual

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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EAS4S81001

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.
EWA4C81001
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.
THROTTLE BODIES
c. Connect the pressure gauge "2" and
adapter "3" to the fuel hose (fuel tank to pri-
mary injector fuel rail).
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/
2
cm )
Faulty → Replace fuel pump.
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EAS27030
ADJUSTING THE THROTTLE POSITION
SENSOR (FOR THROTTLE VALVES)
1. Check:
• Throttle position sensor (for throttle valves)
Refer to "CHECKING THE THROTTLE
POSITION SENSOR (FOR THROTTLE
VALVES)" on page 8-97.
2. Adjust:
• Throttle position sensor angle
7-6