Checking The Primary Injectors; Checking The Throttle Bodies; Checking The Rollover Valve (For California Only); Checking The Fuel Pressure - Yamaha YZFR6V Service Manual

EAS26980

CHECKING THE PRIMARY INJECTORS

1. Check:
• Injectors
Damage → Replace.
EAS26990

CHECKING THE THROTTLE BODIES

1. Check:
• Throttle bodies
Cracks/damage → Replace the throttle bod-
ies 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 compressed
air.
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ET2C05001
CHECKING THE ROLLOVER VALVE (for
California only)
1. Check:
• Rollover valve "1"
Damage/faulty → Replace.
NOTE:
• Check that air flows smoothly only in the direc-
tion of the arrow shown in the illustration.
• The rollover valve must be in an upright posi-
tion when checking the airflow.
EAS27010

CHECKING THE FUEL PRESSURE

1. Check:
• Fuel pressure
M MMM M MMM M M MMM M M MMM M
a. Remove the rider seat.
Refer to "GENERAL CHASSIS" on page 4-1.
M MMM M M MMM M MMM
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M MMM M M MMM M MMM
7-12
THROTTLE BODIES
b. Disconnect the fuel hose (fuel tank to primary
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.
1
c. Connect the pressure gauge "2" and adapter
"3" to the fuel hose (fuel tank to primary injec-
tor fuel rail).
Pressure gauge
90890-03153
Pressure gauge
YU-03153
Fuel pressure adapter
90890-03176
YM-03176
1
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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2
3
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