9 - 20– +ELECELECTRIC STARTING SYSTEMCHECKING THE STARTER MOTOR1.Check: CommutatorDirty → Clean it with #600 grit sandpaper.2.Measure: Commutator diameter aOut of specification → Replace the startermotor.3.Measure: Mica undercut bOut of specification → Scrape the mica usinga hacksaw blade.NOTE:Scrape the mica to the proper measurementusing a hacksaw blade which has beengrounded to fit the commutator.Outside diameter:28 mm (1.10 in)27 mm (1.06 in)Mica undercut:0.7 mm (0.03 in)4.Check: Armature coil (insulation/continuity)Defects → Replace the starter motor.*****************************************************Checking steps: Connect the pocket tester for the continuitycheck 1 and insulation check 2. Measure the armature resistances. If the resistance is incorrect, replace thestarter motor.*****************************************************Armature coil resistance:Continuity check 1:0.025 ~ 0.035 Ω at 20 °C (68 °F)Insulation check 2:More than 1 MΩ at 20 °C (68 °F)
