1994 Johnson Evinrude "ER" 60 LV 150, 150C, 175 Service Manual, P/N 500611, Page 245Get this manual
Cleaning and Inspection
Inspect the brushes; replace if damaged, cracked, or one-half wornReplace brush springs, if weak
2Clean the commutator with 300-grade emery clothIf commutator surface is unevenly worn or pitted, turn it on latheRemove any trace of oil or metal dust from commutator
'151 f161 3Check the armature on growler for shorted turns
Check for grounding by using test light or meterInspect armature insulation for indications of overheating or damaged windingsClean off any carbon deposits or foreign matter which may contribute to later windings failure