KYMCO MX’er 125 Service Manual page 190

15
. IGNITION SYSTEM
High voltage too low
• Weak battery or low engine speed
• Loose ignition system connection
• Faulty CDI unit
• Faulty ignition coil
• Faulty pulser coil
Normal high voltage but no spark at plug
• Faulty spark plug
• Electric leakage in ignition secondary circuit
• Faulty ignition coil
Good spark at plug but engine won't start
• Faulty CDI or incorrect ignition timing
• Faulty change gear control unit
• Improperly tightened A.C. generator flywheel
CDI UNIT INSPECTION
Remove the seat.
15-3
No high voltage
• Faulty ignition switch
• Faulty CDI unit
• Poorly connected or broken CDI ground wire
•Dead battery or faulty regulator/rectifier
• Faulty ignition coil connector
• Faulty pulser coil
Disconnect the CDI coupler and remove the
CDI unit.
Measure the resistance between the terminals
using the electric tester.
.
MX'er SYSTEM