17. IGNITION SYSTEM ATV 300/250 SPECIFICATIONS Item Standard Spark plug Standard type DPR7EA-9 0.60.7 mm Spark plug gap (0.0240.028 in) "F" mark Ignition timing 51BTDC/2000RPM Full advance Primary coil 3.44.1 Ignition coil resistance (20) Secondary without plug cap 14.45 K coil with plug cap 19.8 K Pulser coil resistance (20) 105110 Ignition coil primary side max. voltage 14 V Pulser coil max. voltage 1.6 V Exciter coil max. voltage 14 V TESTING INSTRUMENT Commercially available electric tester with resistance over 10 M/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