Checking The Lean Angle Sensor; Checking The Starter Motor Operation; Checking The Stator Coil; Checking The Rectifier/Regulator - Yamaha WR250FM 2021 Owner's Service Manual

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EAM30298

CHECKING THE LEAN ANGLE SENSOR

1. Check:
• Mounted condition of ECU
Improperly mounted  Remount.
TIP
• The lean angle sensor is built into the ECU.
• The lean angle sensor stops the engine in case
of a turnover.
• To ensure that the lean angle sensor operates
correctly, do not change the installed condition
of the ECU.
EAM30299
CHECKING THE STARTER MOTOR
OPERATION
1. Check:
• Starter motor operation
Does not operate  Perform the electric
starting system troubleshooting, starting with
step (4).
Refer to "TROUBLESHOOTING" on page
8-9.
a. Connect the positive battery terminal "1"
and starter motor lead "2" with a jumper
lead "3".
EWA13810
WARNING
• A wire that is used as a jumper lead must
have at least the same capacity of the bat-
tery lead, otherwise the jumper lead may
burn.
• This check is likely to produce sparks,
therefore, make sure no flammable gas or
fluid is in the vicinity.
b. Check the starter motor operation.
EAM30300

CHECKING THE STATOR COIL

1. Disconnect:
• Stator coil assembly coupler
(from the wire harness)
2. Check:
• Stator coil assembly resistance
ELECTRICAL COMPONENTS
Out of specification  Replace.
Stator coil resistance
0.368–0.552 
a. Connect the digital circuit tester () to the
stator coil assembly coupler.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe 
White "1"
• Negative tester probe 
White "2"
b. Measure the stator coil assembly resis-
tance.
EAM30301

CHECKING THE RECTIFIER/REGULATOR

1. Check:
• Rectifier/regulator output voltage
Out of specification  Replace.
Regulated voltage (DC)
14.0–14.8 V
a. Set the digital tachometer to the ignition
coil.
Digital tachometer
90890-06760
Digital tachometer
YU-39951-B
b. Connect the digital circuit tester (DCV) to
the rectifier/regulator coupler.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
8-67
1
2

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