Yamaha TT-R90(V) Owner's Service Manual page 350

IGNITION SYSTEM
CDI MAGNETO INSPECTION
1. Inspect:
• Pickup coil resistance
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
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