1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 232Get this manual
Trim Tab AdjustmentAll Models The boat may be slightly easier to steer in one direction or the other due to steering forces or other reasonsTo check this, run the boat in straight line with balanced load in an area where current and wind will not be factor
INote single trimset ofadjustment will only relieveconditionseffort tab steering under one speed, trim and loading No
single setting can relieve steering effort under all speed, trim and loading conditions 1Turn the steering wheel in both directions to determine the direction that requires the least amount of steering effort