dink 50 125 1 Manuel atelier : Page 36

          1. GENERAL INFORMATION                                                                  DINK50/125




 TROUBLESHOOTING
 ENGINE WILL NOT START OR IS HARD TO START


 Inspection/Adjustment                          Symptom                  Probable Cause


 Check if fuel reaches
 carburetor by loosening
 drain screw                                                            Empty fuel tank
                                                                        Clogged carburetor fuel inlet tube,
                                                                        vacuum tube or fuel tube
                                                                        Clogged auto fuel valve
                                Fuel reaches         Fuel does not      Clogged float oil passage
                                carburetor           reach carburetor   Clogged fuel tank cap breather
                                                                        hole
                                                                        Clogged fuel strainer
                                                                        Clogged fuel filter
 Remove spark plug and                                                  Faulty fuel pump
 install it into spark plug
 cap to test spark by
 connecting it to engine                                                Faulty spark plug
 ground                                                                 Fouled spark plug
                                                                        Faulty ignition unit
                               Spark jumps          Weak or no spark    Faulty A.C. generator
                                                                        Broken or shorted ignition coil
                                                                        Broken or shorted exciter coil
                                                                        Faulty ignition switch

 Test cylinder                                                          Starter motor idles but crankshaft
 compression                                                            does not rotate
                                                                        Valve clearance too small
                                                                        Improper valve and seat contact
                                Normal                    Low or no     Worn cylinder and piston rings
                                compression               compression   Blown cylinder head gasket
                                                                        Flaws in cylinder head
                                                                        Seized valve
                                                                        Improper valve timing
 Start engine by follow-
 ing normal starting
 procedure
                                                                        Faulty auto bystarter
                              Engine does not        Engine fires but   Air leaking through intake pipe
                              fire                   does not start     Incorrect ignition timing
                                                                        Incorrectly adjusted pilot screw


 Remove spark plug and
 inspect again

                                                                        Flooded carburetor
                               Dry spark plug         Wet spark plug    Faulty auto bystarter
                                                                        Throttle valve excessively open




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