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 17-3