grand dink 125 mmc 1 Workshop-manual : Page 23

          1. GENERAL INFORMATION                                                          GRAND DINK 125/150



 POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS)



 Inspection/Adjustment                          Symptom                    Probable Cause


 Check ignition timing



                                                                           Faulty CDI unit
                               Correct timing        Incorrect timing
                                                                           Faulty A.C. generator

 Check carburetor pilot
 screw adjustment

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

 Check carburetor gasket
 for air leaks

                                                                           Damaged insulator rubber
                                 No air leak              Air leaks        Carburetor not securely
                                                                           tightened
                                                                           Faulty intake manifold gasket
 Remove spark plug and                                                     Deformed carburetor O-ring
 install it into spark plug
 cap to test spark by
 connecting it to engine
 ground
                                                                           Faulty or fouled spark plug
                                                                           Faulty CDI unit
                                                      Weak or inter-       Faulty A.C. generator
                                 Good spark           mittent spark        Faulty ignition coil
                                                                           Broken or shorted high
                                                                           tension wire
 Check carburetor air                                                      Faulty ignition switch
 cut-off valve



                                                                           Damaged air cut-off valve
                                    Good                   Faulty          diaphragm
                                                                           Damaged air cut-off valve
                                                                           spring




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