quannon 125 Workshop-manual : Page 17

          1. GENERAL INFORMATION                                                               QUANNON 125

 POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS)




  Inspection/Adjustment                        Symptom                       Probable Cause


  Check ignition timing



                                                                          Faulty CDI unit
                                   Correct                Incorrect
                                                                          Faulty pulser coil


  Check carburetor pilot
   screw adjustment

                                                                          Mixture too lean (turn screw in)
                              Correctly adjusted   Incorrectly adjusted   Mixture too rich (turn screw out)

 Check carburetor gasket
      for air leaks

                                                                          Faulty intake manifold gasket
                                                                          Carburetor not securely
                                 No air leak              Air leaks       tightened
                                                                          Damaged insulator rubber
                                                                          Broken vacuum tube
 Remove spark plug and
 install it into spark plug
   cap to test spark by
 connecting it to engine
            ground
                                                                          Faulty or fouled spark plug
                                                                          Faulty CDI unit
                                 Good spark              Weak or inter-   Faulty A.C. generator
                                                         mittent spark    Faulty ignition coil
                                                                          Faulty ignition switch

  Check A.C. generator


                                                                          Faulty A.C. generator
                                    Good                   Faulty         Damaged vacuum tube
                                                                          Clogged air vent hole




1-15