Checking The Diode; Checking The Spark Plug Cap; Checking The Ignition Coil - Yamaha RAPTOR YFM125RA Service Manual

EAS28050

CHECKING THE DIODE

1. Check:
• Diode 1
Out of specification → Replace.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
TIP
The pocket tester or the analog pocket tester
reading are shown in the following table.
No continuity
Positive tester probe → Black/
Yellow "1"
Negative tester probe → Sky
blue "2"
Continuity
Positive tester probe → Sky
blue "2"
Negative
Black/Yellow "1"
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a. Disconnect the diode from the wire har-
ness.
b. Connect the pocket tester (Ω × 1) to the
diode coupler as shown.
c. Check the diode for continuity.
d. Check the diode for no continuity.
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EAS28060

CHECKING THE SPARK PLUG CAP

1. Check:
• Spark plug cap resistance
Out of specification → Replace.
Resistance
7.5–12.5 kΩ
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a. Remove the spark plug cap from the spark
plug lead.
→
tester probe
7-38
ELECTRICAL COMPONENTS
b. Connect the pocket tester (Ω × 1 k) to the
spark plug cap as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
c. Measure the spark plug cap resistance.
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EAS28090

CHECKING THE IGNITION COIL

1. Check:
• Primary coil resistance
Out of specification → Replace.
Primary coil resistance
0.18–0.28 Ω
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a. Disconnect the ignition coil connector from
the ignition coil terminal.
b. Connect the pocket tester (Ω × 1) to the
ignition coil as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
Ignition coil terminal "1"
• Negative tester probe
Ignition coil base "2"