1994 Johnson/Evinrude Outboards 40 thru 55 Service Manual, Page 285Get this manual
Cleaning and Inspection
1Inspect the brushes; replace if one-half worn, damaged, or crackedReplace brush springs, if weak2Clean commutator with 300 grade emery clothIf commutator surface is unevenly worn or pitted, turn on latheRemove any trace of oil or metal dust from the commutator]
lsl f61 3Check the armature on growler for shorted turnsCheck