Sym EuroMX 125 Service Manual page 180

Secondary coil
Attached the spark plug cap, measure the
resistance between plug cap side and green
terminal.
Standard value: 7-12 kΩ(20℃)
Remove the spark plug cap, measure the
resistance between plug cap side and green
terminal.
Standard value: 3-5 kΩ(20℃)
Secondary coil is good if resistance within
standard.
Secondary coil is broken if resistance is infinite. If
the spark plug cap attached and the measured
value is exceed standard value, it means the
spark plug cap is in not good.
Replacement
Remove the ignition coil bolt to replace the
ignition coil if necessary.
PULSATOR
Caution
Checking pulsator can be done on engine.
But, the spark plug must be installed onto
the cylinder head, and cylinder compression
pressure must be in normal condition.
Check
Remove body cover.
Remove the pulsator connector.
Measure the resistance between blue/yellow
terminal on engine side and frame ground.
Standard: 50-200Ω(20℃)
Replace the alternator if the measured value
exceeds standard value.
Exciting coil
Remove the exciting coil connector.
Measure the resistance between black/red wire
on engine side and frame ground.
Standard: 400-800Ω(20℃)
Replace the alternator if the measured value
exceeds the standard value.
This Chapter Contents
16. Electrical Equipment
Ignition coil
16-11