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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 ignition unit and the ignition timing cannot be adjusted.
• If the timing is incorrect, inspect the ignition unit and A.C. generator 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 ignition switch according to the continuity table specified in page 19-3.
• Inspect the spark plug referring to Section 3.
• Remove the A.C. generator and pulser coil referring to Section 10.
SPECIFICATIONS
Spark plug
Spark plug gap
Ignition timing
Ignition coil resistance
(20℃
)
Pulser coil resistance (20℃ )
Exciter coil resistance (20℃
Ignition coil primary side max. voltage
Pulser coil max. voltage
Exciter coil max. voltage
TESTING INSTRUMENT
Electric tester: YF-3501
TROUBLESHOOTING
No spark at plug
• Faulty spark plug
• Poorly connected, broken or shorted wire
• Faulty ignition switch
• Faulty ignition coil
• Faulty ignition unit
• Faulty A.C. generator
www.PlanDeGraissage.org
Item
Standard type
"F" mark
Full advance
Primary coil
Secondary without plug cap
coil
with plug cap
)
Standard
NGK DPR7EA9
0.7mm
repeatedly
3.6_
14.45KW
19.8KW
105_
1.8_
14V
1.6V
14V
Engine starts but turns poorly
• Ignition primary circuit
—Faulty ignition coil
—Poorly connected wire or connector
—Poorly contacted ignition switch
• Ignition secondary circuit
—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 ignition unit
YUP 250
4.1W
110W
2.1W
17-2
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Table of Contents
Troubleshooting
