1968 Evinrude Big Twin, Big Twin Electric, Lark 40 HP Outboards Service Manual, Page 83Get this manual
disassemble starter drive, remove drive nut armature shaftremove nut, elamp pinion between soft wood bloeks in viseDO NOT plaee armature assembly between vise jawsNote the relative positions of the parts while disassembling to aid in reassembly later See Figure 7-9 CLEANING, INSPECTION, AND REPAIR
Inspeet the brushes; replaee if one-half worndamaged, or eraekedReplaee brush springs if weakClean eommutator with grade 00 sandpaperIf eommutator surfaee is unevenly worn or pitted, turn latheRemove traee of oil from mutatorCheek the armature growler for shorted turnsSee Figure 7-10Cheek armature for grounding using test light or meterSee Figure 7-11Inspeet armature insulation for indieations of overheating or damaged windingsClean off deposits of earbon or foreign matter whieh tribute to later failure of the windings dCheek field windings, using test light to eheek for eontinuity between field brush lead and frame of motor (ground)See Figure 7-123504
Figure 7-13Cheeking Solenoid