Yamaha TT-R90(T) Owner's Service Manual page 324

IGNITION SYSTEM
CDI MAGNETO INSPECTION
1. Inspect:
Pickup coil resistance
G
Out of specification → Replace.
Tester (+) lead → Red lead 1
Tester (–) lead → White lead 2
Pickup coil
resistance
248 ~ 372 Ω at
20 ˚C (68 ˚F)
2. Inspect:
Source coil resistance
G
Out of specification → Replace.
Tester (+) lead → Brown lead 1
Tester (–) lead → Green lead 2
Source coil
resistance
688 ~ 1,032 Ω
at 20 ˚C (68 ˚F)
6 - 6
– +
ELEC
Tester selector
position
Ω × 100
Tester selector
position
Ω × 100