Checking The Injector - Yamaha YZ450FX 2021 Owner's Service Manual

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EAM30496

CHECKING THE INJECTOR

1. Remove:
• Fuel injector
Refer to "THROTTLE BODY" on page 7-4.
2. Check:
• Fuel injector resistance
Out of specification  Replace.
Resistance
12.0 
a. Disconnect the fuel injector coupler from
the fuel injector.
b. Connect the digital circuit tester () to the
fuel injector coupler.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe 
Injector terminal "1"
• Negative tester probe 
Injector terminal "2"
1
c. Measure the fuel injector resistance.
3 2
Y/W P
Sb
d
1
2
8-59
ELECTRICAL COMPONENTS