Yamaha TT-R125LW Owner's Service Manual page 464

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