Yamaha YZF-R1 Series Service Manual page 481

B
b. Measure the crankshaft position sensor
resistance.
EAS30562
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
8-10.
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.
EAS30566
CHECKING THE STATOR COIL
1. Disconnect:
• Stator coil coupler
(from the wire harness)
Gy
ELECTRICAL COMPONENTS
2. Check:
• Stator coil resistance
Out of specification → Replace the stator coil.
Stator coil resistance
0.112–0.168 Ω
a. Connect the digital circuit tester to the sta-
tor coil coupler as shown.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with ta-
chometer
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.
EAS30680
CHECKING THE RECTIFIER/REGULATOR
1. Check:
• Rectifier/regulator input voltage
Out of specification → Correct the stator coil
condition.
Refer to "CHECKING THE STATOR COIL"
on page 8-46.
Rectifier/regulator input voltage
above 14 V at 5000 r/min
a. Connect the digital circuit tester (AC V) to
the rectifier/regulator coupler as shown.
8-46
1 2 3
W W W