Checking The Stator Coil; Checking The Rectifier/Regulator; Checking The Horn - Yamaha 2010 XMAX YP125R Service Manual

EAS28150

CHECKING THE STATOR COIL

1. Disconnect:
• Stator coil coupler
(from the wire harness)
2. Check:
• Stator coil resistance
Out of specification → Replace the crank-
shaft position sensor/stator assembly.
Stator coil resistance
0.28–0.42 Ω at 20 °C (68 °F)
(YP125R)
0.32–0.48 Ω at 20 °C (68 °F)
(YP250R)
M MMM M MMM M M MMM M
a. Connect the pocket tester (Ω × 1) to the stator
coil coupler as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• 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"
1
2
b. Measure the stator coil resistance.
L LLL L LLL L L LLL L
M MMM M M MMM M M MMM M
3
W W
W
L LLL L L LLL L L LLL L
ELECTRICAL COMPONENTS
EAS28170

CHECKING THE RECTIFIER/REGULATOR

1. Check:
• Charging voltage
Out of specification → Replace the rectifi-
er/regulator.
M MMM M MMM M
a. Connect the engine tachometer to the spark
plug lead.
b. Connect the pocket tester (DC 20 V) to the
battery as shown.
MMM
• Positive tester probe →
positive battery terminal "1"
• Negative tester probe →
negative battery terminal "2"
c. Start the engine and let it run at approximate-
ly 5000 r/min.
d. Measure the charging voltage.
L LLL L LLL L
EAS28180

CHECKING THE HORN

1. Check:
• Horn resistance
Out of specification → Replace.
M MMM M MMM M
a. Disconnect the horn connectors from the
horn terminals.
LLL
b. Connect the pocket tester (Ω × 1) to the horn
terminals.
8-85
Charging voltage
14 V at 5000 r/min
M MMM M M MMM M M MMM M
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
L LLL L L LLL L L LLL L
Coil resistance
1.4 Ω at 20 °C (68 °F)
M MMM M M MMM M M MMM M
M MMM M MMM
L LLL L LLL
M MMM M MMM