1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Repair Manual P/N 507947, Page 272Get this manual
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Cleaning and In spection 1 Inspect the brushes; replace if one-half worn, damaged, cracked Replace brush spr ings, if weak2 Clean commutator with 300 grade cloth If commutator surface is unevenly worn