KYMCO MX 125 - Ignition System; Service Information

15. IGNITION SYSTEM
15-2
MX’er SYSTEM
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• Check the ignition system according to the sequence specified in the Troubleshooting.
• The ignition system adopts CDI unit , change gear control and the ignition timing cannot be
adjusted.
• If the timing is incorrect, inspect the CDI unit, A.C. generator, change gear control and replace
any faulty parts. Inspect the CDI unit with a CDI tester
• Loose connector and poor wire connection are the main causes of faulty ignition system.
Check each connector before operation.
• Use of spark plug with improper heat range is the main cause of poor engine performance.
• The inspections in this section are focused on maximum voltage. The inspection of ignition coil
resistance is also described in this section.
• Inspect the ignition switch according to the continuity table specified in page 17-5.
• Inspect the spark plug referring to Section 3.
SPECIFICATIONS
Item Standard
Standard type CR8E
Spark plug Hot type
Cold type
Spark plug gap 0.60.7mm
Ignition timing
“F” mark
Full advance
15ºBTDC/1,700±100rpm
Primary coil 0.20.3Ω
Ignition coil resistance (20) Secondary with plug cap 3.24.8KΩ
coil
plug cap 4.25.2KΩ
Pulser coil resistance (20) 5060Ω
Exciter coil resistance (20) 100120Ω
Ignition coil primary side max. voltage 12V min.
Pulser coil max. voltage 2.1V min.
TESTING INSTRUMENT
Kowa Electric Tester
or commercially available electric tester with resistance over 10MΩ/CDV