Yamaha TT-R125EY Service Manual page 245

IGNITION SYSTEM
2. Inspect:
1 2
• Source coil resistance
Out of specification → Replace.
Br G
Tester (+) lead → Brown lead 1
R W
Tester ( _ ) lead → Green lead 2
6-6
ELEC
Source coil
Tester selector
resistance position
Ω
688 ~ 1,032
Ω
at 20 °C (68 °F)
– +
x 100