kxr 50 90 Manuel atelier : Page 33

          1. GENERAL INFORMATION                                              Mongoose/KXR 90/50


 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 spark plug

 Check spark plug cap
 and high-tension wire
 for looseness

                                Not loose                Loose      Loose spark plug cap


 Check CDI unit coupler
 for looseness


                                  Good                   Good       Poorly connected coupler

 Measure resistance
 between terminals of
 CDI unit coupler


                                 Normal                Abnormal


 Check related parts

                                                                    Faulty ignition switch
                                                                    Weak battery
                                 Normal                Abnormal     Faulty pulser coil
                                                                    Faulty ignition coil
                                                                    Faulty charging system
                                                                    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


                                                                                           1-30