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2. Ignition system
Preparation system --------------2.1 CDI Group----------------2.4
Failure diagnosis --------------2.2 Ignition coil --------------2.5
Ignition system checking ----------2.3 Trigger-----------------2.6
2.1 Preparing documents
Note of work:
1. Checking the ignition system following the sequence listed in the table of failure diagnosis.
2. The ignition system is solidified in the CDI group and you don’t have to adjust the ignition time.
3. Checking the ignition system following the sequence listed in the table of failure diagnosis.
4. CDI ignition system cannot subject to strong percussion (which is the main reason for failure), so you need to
pay great attention to that.
5. Check whether the connection is bad or not, because usually the reason for failure is poor contact socket.
6. The heat value of the spark plug should be appropriate. Improper spark plug will cause the engine running
unsmooth and even the spark plug will be burn-out.
7.Inspection in this chapter is based mainly on the maximum voltage，also inspection of the ignition coil
impedance is introduced.
8. Check the main switch according to the table.
9. Remove the alternator and stator according to the instructions.
Preparing standards
Items Standard value
Standard
C5HSA(NGK)
Hot type
C6HSA(NGK)
Spark plug
recommended
Cold type
C7HSA(NGK)
Spark gap
0.6-0.7mm
Primary coil
0.6Ω±10％
With plug cap
5-11KΩ
Ignition coil
impedance
（20）
Secondary coil
Without plug cap
0.5-5.5KΩ
Resistance of trigger（20）
100-500Ω
Measure the maximum voltage after ignition coil
rotates once
95-400V
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