Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 14Get this manual
TRIMMING OUTBOARDOUT" (" UP" ) '
Trim Tab Adjustment
SINGLE OUTBOARD IMPORTANT: For dual outboard trim tab adjustment, refer to Instructions outlined in Section 7AOutboard Motor InstallationAttachments"" Ride Guide Steering Cable Attaching Kit Installation (92876A6)"" Trim Tab Adjustment 1Check trim tab position as follows: aOperate boat at the speed at which it would normally be operatedbIf the boat pu lls to the right (starboard)the traiting edge of trim tab must be moved to the rightIf the boat pulls to the left (port), the trailing edge of trim tab must be moved to the left