Yamaha DT125RE 2005 Service Manual page 268

7. source coil resistance
• Disconnect the CDI magneto coupler
from the wireharness.
• Connect the pocket tester (Ω 100) to the
source coil.
Positive tester probe
Terminal
Negative tester probe
Teminal
3
2
• Measure the source coil resistance.
Source coil resistance
192~288 Ω at 20°C (68°F)
• Is the source coil resistance OK?
YES
Replace the source
coil.
Green/white
Black/red
1
NO
IGNITION SYSTEM
EAS00748
8. Pickup coil resistance
• Disconnect the CDI magneto coupler from
the wire harness.
• Connect the pocket tester (Ω 100) to the
pickup coil.
Positive tester probe
Negative tester probe
2
3
• Measure the pickup coil resistance.
Pickup coil resistance
280 ~ 420 Ω at 20°C (68°F)
(between white/red and
white/blue)
• Is the pickup coil OK?
YES
EAS00754
9. Wiring
• Check the entire ignition system's wiring.
Refer to "CIRCUIT DIAGRAM".
• Is the ignition system's wiring properly con-
nected and without defects?
YES
Replace the DC-
CDI unit.
8-11
ELEC
white/blue
white/red
1
NO
Replace the pickup
coil.
NO
Properly connect or
repair the ignition
system's wiring.