1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 308Get this manual
Trim Tab Adjustment 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 single trim tab adjustment will only relieve steering effort under one set of speed, trim and load conditionsNo single setting can relieve steering effort under all speed, trim and load conditions1Turn the steering wheel in both directions to determine the direction that requires the least amount of steering effort2Loosen the trim tabIf the boatpulls to port, move the rear of the trim tab to port pulls to starboard, move the rear of the trim tab to starboard