1998 Johnson Evinrude "EC" 90, 100C, 105C, 115, 150, 150C, 175 60 deg. LV Service Repair Manual, P/N 520210, Page 260Get this manual
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Trim Tab Adjustment
If the boat pulls to the left or right when its load is evenly distributed, adjust the trim tab as follows:
With the motor shut OFF, loosen the trim tab screwIf