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II.Ignition system
Preparation data ----------------- 2.1 CDI group ----------------------2.4
Fault diagnosis ------------------ 2.2 Ignition coil ------------------- 2.5
Ignition system inspection ----- 2.3 Trigger ------------------------- 2.6
2.1 Preparation data
Matters needing attention in operation
1. Inspect the ignition system in accordance with the order stipulated in the fault diagnosis table.
2. The ignition system is an electronic auto-advance device integrated in the CDI group, therefore the ignition time
needs no adjustment.
3. Inspect the ignition system in accordance with the order stipulated in the fault diagnosis table.
4.Take particular care in disassembly that the CDI group of ignition system should not fall off and drop down or
should not stricken with might（which is the main cause of fault）
5. Bad socket contact is the main cause of the ignition system fault, so inspect whether the joint of each part is in
poor contact or not.
6. Inspect whether the spark plug is utilized at a proper thermal value. Improper spark plug may lead to unsmooth
operation of engine or burn-out of the spark plug.
7. Inspection in the chapter is based on explanation of peak voltage and the judgment whether the resistance value
of ignition coil is OK or not according to records after the inspection.
8. Inspection of the main switch should be performed in accordance with the conduction table.
9. The disassembly of the alternator and stator should be conducted in accordance with the disassembly
explanation.
Preparation reference
Item Standard value
Standard
C5HSA(NGK)
Hard plug
C6HSA(NGK)
Recommended
spark plug
Soft plug C7HSA(NGK)
Spark plug gap 0.6-0.7mm
Primary coil 0.6Ω±10％
With spark plug
cover
5-11KΩ
Resistance
value of
ignition coil
（20）
Secondary coil
Without spark
plug cover
0.5-5.5KΩ
Resistance value of the trigger（20℃） 100-500Ω
Measured peak voltage of ignition coil at one go 95-400V
Trigger voltage Above 1.7V
Voltage of charge coil 95-400V
Tools
Accessory of peak voltage meter
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