Checking The Fuel Pressure - Yamaha Grizzly550 User Manual

EAS27010

CHECKING THE FUEL PRESSURE

1. Check:
• Fuel pressure
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a. Remove the rear fender.
Refer to "GENERAL CHASSIS" on page 4-1.
b. Remove the fuel hose connector holder.
c. Disconnect the fuel hose "1" from the fuel
pump.
TIP
• When removing the fuel hose from the fuel
pump, remove the fuel hose connector holder
first, and next, insert a slotted head screwdriver
etc. in the slot part "a" of the fuel hose connec-
tor cover "2", then slide it in the direction of the
arrow, and remove the fuel hose.
• Before removing the hose, place a few rags in
the area under where it will be removed.
2
a
1
d. Connect the pressure gauge "3" and adapter
"4" to the fuel pump and fuel hose.
Pressure gauge
90890-03153
YU-03153
Fuel pressure adapter
90890-03176
YM-03176
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2
1
7-7
THROTTLE BODY
1
3
e. Start the engine.
f. Measure the fuel pressure.
Out of specification → Replace the fuel
pump.
Fuel pressure
324 kPa (3.24 kgf/cm², 46.1 psi)
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EAS27030
ADJUSTING THE THROTTLE POSITION
SENSOR
1. Check:
• Throttle position sensor
Refer to "CHECKING THE THROTTLE PO-
SITION SENSOR" on page 9-96.
2. Adjust:
• Throttle position sensor angle
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a. Connect the throttle position sensor coupler
to the throttle position sensor.
b. Connect the digital circuit tester to the throttle
position sensor coupler.
• Positive tester probe
yellow "1"
• Negative tester probe
black/blue "2"
Digital circuit tester
90890-03174
Model 88 Multimeter with ta-
chometer
YU-A1927
L Y
4
L LLL L L LLL L LLL
M MMM M M MMM M MMM
B/L
1 2