15. IGNITION SYSTEM
15-3
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• Check the ignition system according to the sequence specified in the Troubleshooting.
• The ignition system adopts ignition unit, change gear control and the ignition timing cannot be
adjusted.
• If the timing is incorrect, inspect the ignition unit, A.C. generator, change gear control and
replace any faulty parts. Inspect the ignition unit with a ignition unit 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 spark plug referring to chapter 3.
SPECIFICATIONS
Item Standard
90cc/70cc/50cc-4T NGK-CR7HSA
Spark plug Standard type
50cc-2T BR8HAS
Spark plug gap 0.6～0.7mm
90cc
28º±1ºBTDC/4000RPM
70cc
13ºBTDC/1800±100rpm
50cc-4T
13ºBTDC/2000±100rpm
Ignition timing
“F” mark Full
advance
50cc-2T
15ºBTDC/1700±100rpm
90cc/70cc/50cc-4T 1.5～3.5Ω
Primary coil
50cc-2T 3.7～15.2Ω
without plug cap 2～5 KΩ
Ignition coil resistance
(20°C)
Secondary coil
with plug cap 7～9 KΩ
90cc/70cc/50cc-4T 100～140 ΩPulser coil resistance
(20°C)
50cc-2T 80～160Ω
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