Yamaha TTR90(M) Owner's Service Manual page 272

IGNITION SYSTEM
EC626002
IGNITION COIL INSPECTION
1. Inspect:
Primary coil resistance
Out of specification
Tester (+) lead
Tester (–) lead
Primary coil
resistance
0.18 ~ 0.28
20 ˚C (68 ˚F)
2. Inspect:
Secondary coil resistance
Out of specification
Tester (+) lead
Tester (–) lead
Secondary coil
resistance
6.3 ~ 9.5 k
20 ˚C (68 ˚F)
NOTE:
When inspecting the secondary coil resis-
tance, remove the spark plug cap.
EC627011
CDI MAGNETO INSPECTION
1. Inspect:
Pickup coil resistance
Out of specification
Tester (+) lead
Tester (–) lead
Pickup coil
resistance
248 ~ 372
20 ˚C (68 ˚F)
6 - 4
–
ELEC
Replace.
Orange lead 1
Black lead 2
Tester selector
position
at
1
Replace.
Spark plug lead 1
Orange lead 2
Tester selector
position
at
k 1
Replace.
Red lead 1
White lead 2
Tester selector
position
at
100
+