Yamaha 2004 YXR660 Service Manual page 360

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5. Spark plug cap resistance
• Remove the spark plug cap.
• Connect the pocket tester (Ω × 1k) to the
spark plug cap.
• Check that the spark plug cap has the
specified resistance.
Spark plug cap resistance
10 kΩ at 20 °C (68 °F)
6. Ignition coil resistance
• Disconnect the ignition coil connector from
the wire harness.
• Connect the pocket tester (Ω × 1) to the
ignition coil.
Tester (+) lead → Orange lead terminal
Tester (–) lead → Ignition coil base
• Check that the primary coil has the speci-
fied resistance.
Primary coil resistance
0.18 ~ 0.28 Ω at 20 °C (68 °F)
• Connect the pocket tester (Ω × 1k) to the
ignition coil.
Tester (+) lead → Orange lead terminal
Tester (–) lead → Spark plug lead
• Check that the secondary coil has the
specified resistance.
Secondary coil resistance
6.32 ~ 9.48 kΩ at 20 °C (68 °F)
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IGNITION SYSTEM
MEETS
SPECIFICATION
BOTH MEET
SPECIFICATION
9 - 12
OUT OF SPECIFICATION
Replace the spark plug cap.
OUT OF SPECIFICATION
Replace the ignition coil.
– +
ELEC