Zontes ZT125-M 2022, Maintenance Manual

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4. Ignition system
Know Before Service
1. The content of this chapter requires certain maintenance experience. It is recommended to check or repair with a qualified
maintenance organization.
2. Do not disassemble the parts connected to the 12V power supply at will after power-on, to avoid the self-inductance of the
coil in the electrical appliance, which may damage the ECU or sensor due to the instantaneous voltage.
3. Use spark plugs with correct calorific value. Spark plugs with improper calorific value may damage the engine.
4. Ignition system failures include poor plug connection and corrosion of wiring terminals. These two items should be checked
first.
5. Since the ECU is factory preset, the ignition timing cannot be adjusted. If you need to adjust the ignition timing, you can only
return to the factory for repair.
6. Ensure that the battery has sufficient power. If the power is insufficient, it may result in a slow start speed or weak spark
intensity of the spark plug or no spark.
Tool
：
Multimeter
7. The driving conditions and maintenance conditions of each vehicle are different, so it is impossible to list all the fault
phenomena and troubleshooting procedures one by one. Only some of the more common faults can be listed. Maintenance
personnel themselves also need to have certain professional knowledge and experience accumulation process.
8. See the section "Spark plug" in the chapter "Maintenance" of this manual for details of spark plug disassembly and inspection.
Before disassembling the spark plug, clean up the surrounding debris and dust with a dust blower. After disassembly, the spark
plug port must be blocked to prevent foreign matter from falling into the engine.
●Do not plug and unplug the plugs of various parts at will, and it is forbidden to clean the plugs directly with water. After
plugging and unplugging, be sure to check whether it is plugged back correctly.