Yamaha YZFR1W 2007 Service Manual page 410

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a. Disconnect the relay unit coupler from the
wire harness.
b. Connect the pocket tester (Ω × 1) to the
relay unit terminal as shown.
c. Check the relay unit (diode) for continuity.
d. Check the relay unit (diode) for no continu-
ity.
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EAS28100
CHECKING THE IGNITION COILS
The following procedure applies to all of the
ignition coils.
1. Check:
• Primary coil resistance
Out of specification → Replace.
Primary coil resistance
0.85–1.15 Ω at 20 °C (68°F)
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a. Disconnect the ignition coil connectors
from the ignition coil terminals.
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
• Negative tester probe
Ignition coil terminal
ELECTRICAL COMPONENTS
c. Measure the primary coil resistance.
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2. Check:
• Secondary coil resistance
Out of specification → Replace.
Secondary coil resistance
5.02–6.79 kΩ at 20 °C (68 °F)
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a. Disconnect the ignition coil leads 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
• Negative tester probe
Ignition coil terminal "1"
• Positive tester probe
Spark plug terminal "2"
c. Measure the secondary coil resistance.
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3. Check:
• Ignition spark gap
Out of specification → Replace.
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