Checking The Pressure Regulator; Checking The Fuel Pump And Pressure Regulator Operation - Yamaha YZF-R1S Service Manual

THROTTLE BODIES

CHECKING THE PRESSURE REGULATOR

1. Check:
S pressure regulator
Damage ! Replace.
CHECKING THE FUEL PUMP AND
PRESSURE REGULATOR OPERATION
1. Check:
S pressure regulator operation
a. Remove the fuel tank.
Refer to "FUEL TANK" in chapter 3.
b. Disconnect the negative pressure hose 1
from the pressure regulator at the joint.
c. Connect the vacuum/pressure pump gauge
set 2 onto the negative pressure hose from
the pressure regulator.
d. Connect the pressure gauge 3 and adapter
4 onto the fuel injection pipe.
Vacuum/pressure pump gauge set
90890-06756, YB-35956
Pressure gauge
90890-03153, YU-03153
Adapter
90890-03176, YM-03176
e. Install the fuel tank.
Refer to "FUEL TANK" in chapter 3.
f. Start the engine.
g. Measure the fuel pressure.
Fuel pressure
294 kPa (2.94 kg/cm
h. Use the vacuum pressure pump gauge set to
adjust the fuel pressure in relation to the vac-
uum pressure as described below.
NOTE:
The vacuum pressure should not exceed 100
kPa (760 mmHg, 29.9 inHg).
7-40
FI
2
, 42.6 psi)