Checking The Starter Motor Operation; Checking The Stator Coil; Checking The Rectifier/Regulator - Yamaha YZ 2019 Series Owner's Service Manual

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c. Incline the lean angle sensor.
d. Measure the lean angle sensor output volt-
age.
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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 "ELECTRIC STARTING SYSTEM"
on page 8-5.
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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.
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8-64
ELECTRICAL COMPONENTS
EAM30300

CHECKING THE STATOR COIL

1. Disconnect:
• Stator coil coupler
(from the wire harness)
2. Check:
• Stator coil resistance
Out of specification  Replace the stator coil.
Stator coil resistance
0.528–0.792 
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a. Connect the digital circuit tester () to the sta-
tor coil coupler as shown.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe 
White "1"
• Negative tester probe 
White "2"
• Positive tester probe 
White "1"
• Negative tester probe 
White "3"
• Positive tester probe 
White "2"
• Negative tester probe 
White "3"
b. Measure the stator coil resistance.
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EAM30301

CHECKING THE RECTIFIER/REGULATOR

1. Check:
• Charging voltage
Out of specification  Replace the rectifi-
er/regulator.
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