quannon 125 Workshop-manual : Page 19

          1. GENERAL INFORMATION                                                           QUANNON 125

 POOR PERFORMANCE (AT HIGH SPEED)




 Inspection/Adjustment                    Symptom                       Probable Cause


  Check ignition timing



                                                                      Faulty CDI unit
                               Correct               Incorrect
                                                                      Faulty pulser coil


 Check valve clearance


                                                                      Improperly adjusted valve clearance
                               Correct               Incorrect
                                                                      Worn valve seat


   Check fuel filter for
     fuel supply


                                                                      Empty fuel tank
                           Fuel flows freely   Fuel flow restricted   Clogged fuel filter
                                                                      Clogged fuel tank cap breather
                                                                      hole
  Check carburetor for
     clogged jets


                            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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