17. IGNITION SYSTEM
17-3
MXU 300/250
SPECIFICATIONS
Item Standard
Spark plug Standard type DPR7EA-9
Spark plug gap 0.6～0.7mm
Ignition timing
“F” mark
Full advance
5º±1ºBTDC/1000RPM
Primary coil 3.4～4.1Ω
Ignition coil resistance (20℃) Secondary without plug cap 14.45KΩ
coil
with plug cap 19.8KΩ
Pulser coil resistance (20℃) 105～110Ω
Ignition coil primary side max. voltage 14V
Pulser coil max. voltage 1.6V
Exciter coil max. voltage 14V
TESTING INSTRUMENT
Commercially available electric tester with resistance over 10MΩ/CDV.
TROUBLESHOOTING
High voltage too low No high voltage
• Weak battery or low engine speed • Faulty ignition switch
• Loose ignition system connection • Faulty ignition unit
• Faulty ignition unit • Poorly connected or broken ignition unit
ground wire
• Faulty ignition coil •Dead battery or faulty regulator/rectifier
• Faulty pulser coil • Faulty ignition coil connector
Normal high voltage but no spark at plug • Faulty pulser coil
• Faulty spark plug
• Electric leakage in ignition secondary circuit
• Faulty ignition coil
Good spark at plug but engine won‘t start
• Faulty ignition unit or incorrect ignition timing
• Faulty change gear control unit
• Improperly tightened A.C. generator flywheel
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