Yamaha YZ250F(E) - Checking the Fuel Injector

ELECTRICAL COMPONENTS
8-47
EAS1SM1349
CHECKING THE FUEL INJECTOR
1. Remove:
• Fuel injector
Refer to “THROTTLE BODY” on page 7-5.
2. Check:
• Fuel injector resistance
Out of specification  Replace.
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Disconnect the fuel injector coupler from the
fuel injector.
b. Connect the pocket tester ( 10) to the
fuel injector coupler.
c. Measure the fuel injector resistance.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
Continuity
Positive tester probe 
Sky blue “1”
Negative tester probe 
Sensor terminal “a”
Continuity
Positive tester probe 
Black/Yellow “2”
Negative tester probe 
Sensor terminal “b”
Continuity
Positive tester probe 
Pink “3”
Negative tester probe 
Sensor terminal “b”
Fuel injector resistance
12.0 
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe 
Injector terminal “1”
• Negative tester probe 
Injector terminal “2”
bca
B/Y
P
Sb
2
1
3
12