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John-

With most medium and large outboard motors, there is tilt and trim. The trim feature raises the engine in fine adjustments to change the attitude of the boat for best performance.

When at hull speed, tuck the motor all the way "down" or "in". After reaching a plane and your desired speed, you adjust engine trim "out" to lower the bow. Watch your GPS speed, as you increase trim, the speed will rise without changing throttle. When you see your speed drop with more trim back off a bit. You will also notice the steering feel get light when properly set.

Too much trim leads to porpoising.