1988 Johnson Evinrude "CC" 9.9 thru 30 Service Repair Manual, P/N 507660, Page 325Get this manual
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[7J Cleaning and Inspection 1 Inspect the brushes; replace if one- half worn, damaged, or crackedReplace brush springs, if weak2 Clean commutator with 300 grade emery cloth If commutator surface is un