2007 Evinrude E-Tec 75, 90 HP outboards Service Manual, Page 146Get this manual
ELECTRICAL AND IGNITION ELECTRIC STARTER SERVICING Remove brush holder cap from armature and frame assemblyDo not lose the brush springsClean 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 commutatorCheck the armature on growler for shorted turns using test light or meterInspect armature insulation for indications of overheating or damaged windingsClean off any carbon deposits or foreign matter which could contribute to failure of windings