kxr 50 90 Manuel atelier : Page 31

          1. GENERAL INFORMATION                                                  Mongoose/KXR 90/50


 POOR PERFORMANCE (AT HIGH SPEED)



 Inspection/Adjustment                    Symptom                      Probable Cause


 Check ignition timing



                                                                     Faulty CDI unit
                           Correct timing       Incorrect timing
                                                                     Faulty pulser coil

 Check valve clearance


                                                                     Improperly adjusted valve
                         Correctly adjusted   Incorrectly adjusted   clearance
                                                                     Worn valve seat
 Check fuel pump for
 fuel supply
                                                                     Empty fuel tank
                                                                     Clogged fuel tube or filter
                         Fuel flows freely    Fuel flow restricted
                                                                     Clogged Fuel tank cap breather
 Check carburetor jets                                               hole
 for clogging


                            Not clogged              Clogged         Clean and unclog


 Check valve timing


                              Correct                Incorrect       Cam timing gear aligning marks
                                                                     not aligned

 Check valve spring
 tension


                           Not weakened             Weak spring      Faulty spring




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