Checking The Pickup Coil - Yamaha 2009 YFM25RY Service Manual

Secondary coil resistance
6.32–9.48 kΩ
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a. Disconnect the spark plug cap from the
ignition coil.
b. Connect the pocket tester (Ω × 1k) to the
ignition coil as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
High tension code "1"
• Negative tester probe
Orange "2"
c. Measure the secondary coil resistance.
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3. Check:
• Ignition spark gap
Out of specification → Replace.
Minimum ignition spark gap
6.0 mm (0.24 in)
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a. Disconnect the spark plug cap from the
spark plug.
b. Connect the ignition checker/Opama pet-
4000 spark checker "1" as shown.
Ignition checker
90890-06754
Opama pet-4000 spark checker
YM-34487
ELECTRICAL COMPONENTS
2. Spark plug cap
c. Set the main switch to "ON".
d. Measure the ignition spark gap "a".
e. Crank the engine by pushing the starter
switch and gradually increase the spark
gap until a misfire occurs.
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EAS28110

CHECKING THE PICKUP COIL

1. Disconnect:
• Pickup coil coupler
(from the wire harness)
2. Check:
• Pickup coil resistance
Out of specification → Replace.
Pick up coil resistance
248–372 Ω (R–W)
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a. Connect the pocket tester (Ω × 100) to the
pickup coil terminal as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
Red "1"
• Negative tester probe
White "2"
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