17. IGNITION SYSTEM
SERVICE INFORMATION
GENERAL INSTRUCTIONS
· Check the ignition system according to the sequence specified in the Troubleshooting. ( 1-28)
· The ignition system adopts CDI unit and the ignition timing cannot be adjusted.
· If the timing is incorrect, inspect the CDI unit and A.C. generator and replace any faulty parts.
Inspect the CDI unit with a CDI 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 ignition switch according to the continuity table specified in page 20-3.
· Inspect the spark plug referring to Section 3.
· Remove the A.C. generator and pulser coil referring to Section 10.
SPECIFICATIONS
Item Standard
SH10BA BR8HSA
Spark plug
SH10AA BR6HSA
Spark plug gap 0.81.0mm
Ignition timing 13.5°2°BTC/2000rpm
Primary coil 0.1530.187
Ignition coil resistance (20) Secondary without plug cap 3.243.96K
coil with plug cap 6.9910.21K
Pulser coil resistance (20) 50170
Exciter coil resistance (20) 50350
Ignition coil primary side max. voltage 244V
Pulser coil max. voltage 10.5V
Exciter coil max. voltage 244V
TESTING INSTRUMENT
Electric tester
TROUBLESHOOTING
No spark at plug Engine starts but turns poorly
· Faulty spark plug · Ignition primary circuit
· Poorly connected, broken or shorted wire --Faulty ignition coil
· Faulty ignition switch --Poorly connected wire or connector
· Faulty ignition coil --Poorly contacted ignition switch
· Faulty CDI unit · Ignition secondary circuit
· Faulty A.C. generator --Faulty ignition coil
--Faulty spark plug
--Faulty high-tension wire
--Poorly insulated plug cap
· Improper ignition timing
--Faulty A.C. generator
--Stator not installed properly
--Faulty CDI unit
17-2
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