Checking The Injectors; Checking The Throttle Bodies; Checking The Fuel Pressure; Adjusting The Throttle Position Sensor (For Throttle Valves) - Yamaha YZF-R1 2007 Service Manual

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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.
email: info@motomatrix.co.uk
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 8-101.
2. Adjust:
• Throttle position sensor angle
7-6