Yamaha YZ450F(S) Owner's Service Manual page 574

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