mxu 250 300 Workshop-manual : Page 328

          17. IGNITION SYSTEM                                                                    MXU 300/250

 SPECIFICATIONS
                                 Item                                        Standard
 Spark plug                                  Standard type             DPR7EA-9
 Spark plug gap                                                        0.60.7mm
                                 "F" mark
 Ignition timing                                                       51BTDC/1000RPM
                                 Full advance
                                  Primary coil                         3.44.1
 Ignition coil resistance (20) Secondary without plug cap              14.45K
                                  coil         with plug cap           19.8K
 Pulser coil resistance (20)                                           105110
 Ignition coil primary side max. voltage                               14V
 Pulser coil max. voltage                                              1.6V
 Exciter coil max. voltage                                             14V


 TESTING INSTRUMENT
 Commercially available electric tester with resistance over 10M/CDV.




 TROUBLESHOOTING
 High voltage too low                                  No high voltage
 · Weak battery or low engine speed                    · Faulty ignition switch
 · Loose ignition system connection                    · Faulty ignition unit
 · Faulty ignition unit                                · Poorly connected or broken ignition unit
                                                          ground wire
 · Faulty ignition coil                                ·Dead battery or faulty regulator/rectifier
 · Faulty pulser coil                                  · Faulty ignition coil connector
 Normal high voltage but no spark at plug              · Faulty pulser coil
 · Faulty spark plug
 · Electric leakage in ignition secondary circuit
 · Faulty ignition coil
 Good spark at plug but engine won`t start
 · Faulty ignition unit or incorrect ignition timing
 · Faulty change gear control unit
 · Improperly tightened A.C. generator flywheel




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