Yamaha YZ450F Owner's Service Manual page 339

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a. Disconnect the fuel injector coupler from the
fuel injector.
b. Connect the pocket tester (  10) to the
fuel injector coupler.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe 
Injector terminal "1"
• Negative tester probe 
Injector terminal "2"
1
c. Measure the fuel injector resistance.
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2
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ELECTRICAL COMPONENTS