Yamaha YZ450FT Owner's Service Manual page 278

2
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W Br
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IGNITION SYSTEM
EC626002
IGNITION COIL INSPECTION
1. Remove the ignition coil cap.
2. Inspect:
• Primary coil resistance
Out of specification → Replace.
Tester (+) lead → Orange lead 1
Tester (–) lead → Black lead 2
Primary coil
resistance
0.08 ~ 0.10 Ω at
20 °C (68 °F)
3. Inspect:
• Secondary coil resistance
Out of specification → Replace.
Tester (+) lead → Orange lead 1
Tester (–) lead → Spark plug terminal 2
Secondary coil
resistance
4.6 ~ 6.8 kΩ at
20 °C (68 °F)
4. Inspect:
• Sealed portion of ignition coil a
• Spark plug terminal pin b
• Threaded portion of spark plug c
Wear → Replace.
EC627011
CDI MAGNETO INSPECTION
1. Inspect:
• Pick-up coil resistance
Out of specification → Replace.
Tester (+) lead → Red lead 1
Tester (–) lead → White lead 2
Pick-up coil
resistance
P
248 ~ 372 Ω at
B
20 °C (68 °F)
6 - 5
– +
ELEC
Tester selector
position
Ω × 1
Tester selector
position
kΩ × 1
Tester selector
position
Ω × 100