1997 Johnson Evinrude "EU" 90 thru 115 90 CV Service Manual, P/N 507267, Page 235Get this manual
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4Remove pinion and base
m INotel Before disassembly, scribe marks on frame and end
caps for reference during reassembly
5Remove the two thru-bolts and separate components
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 commutator