1992 Johnson Evinrude "EN" 9.9 thru 30 Service Manual, P/N 508142, Page 261Get this manual
Trim Tab Adjustment20, 25, 30 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 factorsA single trim tab adjustment will relieve steering effort under only one set of speed, trim, and load conditionsNo single setting can relieve steering effort under all speed, trim, and load conditions1Turn the steering handle in both directions to determine the direction that requires the least amount of steering effort