1994 Johnson/Evinrude Electric outboards Service Manual, Page 109Get this manual
Cleaning and Inspection
1Inspect the brushes, and replace them if they are less than 3B in(9 mm) longReplace brush springs if damaged2Clean commutator with 300 grade emery clothIf commutator surface is unevenly worn or pitted, turn it in latheRemove any trace of oil or metal dust from the commutator