Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 40Get this manual
GENERAL INFORMATION
In rare circumstances, the owner may decide to limit the trim inTh is can be accomplished by repositioning th tilt stop pins into whatever adjustment holes in the transom brackets is desired
Avoid possible serious injury or deathAdjust outboard to an trim position as soon as boat is on plane to avoid possible ejection due to boat spin-outDo not attempt to turn boat when on plane if outboard is trimmed extremely in or down and there is pull on the steering wheel or tiller handle
a- Tilt Stop Pins