CHAPTER 3C ENGINE 100/125/150/200 SERVICE MANUAL09.0
CHAPTER 3C ENGINE PAGE.3C - 32 -
3.7 IGNITION SYSTEM
3.7.1 INSTALLATION INFORMATION
OPERATING POINTS
● Check ignition system in accordance with the troubleshooting procedure in section 3.11.2
● As the ignition system has an electric automatic spark control in CDI unit, there is no need
for spark advance angle adjustment.
● Poor contact may be the cause of many ignition system faulty cases. Check all terminal
connections to be sure they are clean and tight whenever troubleshooting an electrical
problem.
● Make sure spark plug heat range is correct. Using incorrect spark plug will result in
improper engine operation or spark plug damage.
● Peak voltage is used as reference point in tests. Record coil resistance tests.
REFERENCE STANDARD
item Standard value
Specific spark plug (NGK)C7HSA
spark plug gap 0.6-0.7mm
spark
plug
angle
Maximum advance in “F”
position
13°±1°(1700r/min)
Primary coil 0.1-1.0Ω
Wit
h
ca
p
7-9kΩ
Ignition coil
resistance(20℃)
S
e
c
o
n
d
ar
y
Wit
ho
ut
ca
p
3-4kΩ
Pickup coil resistance(20℃)
80-160Ω
Primary Ignition coil peak voltage Over 120V
Pickup coil peak voltage Over 2.1V
3.7.2 TROUBLESHOOTING
High Tension Voltage Too Low
● Crankshaft revolution too low or battery voltage too low
● Ignition system wiring loose
● Faulty Ignition coil
● Faulty CDI unit
● Faulty pickup coil
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