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1. GENERAL INFORMATION QUANNON 125
NO SPARK AT SPARK PLUG
Inspection/Adjustment Symptom Probable Cause
Replace with a new
spark plug and inspect
again
Weak or no spark Good spark Faulty old spark plug
Check spark plug cap
and ignition coil wire for
looseness
Not loose Loose Loose spark plug cap
Check CDI unit coupler
for looseness
Normal Abnormal Poorly connected coupler
Measure resistance
between CDI unit coupler
wire terminals
Normal Abnormal
Check related parts
Faulty ignition switch
Abnormal Faulty exciter coil
Normal Faulty pulser coil
Faulty ignition coil
Broken wire harness
Poorly connected coupler
Check CDI unit with a
CDI unit tester
Normal Abnormal Faulty CDI unit
Check ignition coil with a
CDI unit tester
Abnormal Faulty ignition coil
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