1992 Johnson Evinrude "EN" Electric Outboards Service Manual, P/N 508140, Page 93Get this manual
Cleaning and Inspection
1Inspect the brushes, and replace if one-half worndamaged, or cracked Replace brush springs, if weak2 Clean commutator with 300 grade emery clothIf commutator surface is unevenly worn or pitted, turn on latheRemove any trace of oil or metal dust from commutator
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Check the armature on growler for shorted turnsCheck armature for grounding by using test light or meterInspect armature insulation for indications of overheating or damaged indingsClean off any deposits of carbon or foreign matter which may contribute to later failure of the windings