quannon 125 Workshop-manual : Page 21

          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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