Simply start with the engine in idle followed by trimming the motor out by one-half to full trim.

How to determine outboard motor height. As a yacht designer and boater I prefer longer shafts. Not sure about the newer 4 strokes but I have the same rig 2002 with a 2 stroke and 5500 RPMs is the WOT max. The outboard length is alternatively referred to as the motor shaft length.

Each hole represents a 34-inch change in elevation. This exhaust port should be about 1 inch above the water line when the boat is idling. The Anti-Ventilation plate is observed while the boat is operating at planing speed with the normal engine trim setting.

Jim Hendricks Sport Fishing Magazine. I do want to make sure the motor height is right though even if performance is only slightly affected. A manual jack plate adjusts the motor height with wrenches.

If the propeller fails to ventilate the motor is mounted to low. Remember you need to find the best motor height for a given set back. Motor height on pontoon boat.

The A-V plate should be running just at or just above the surface of the water flowing around it. How to Measure Transom Height For vessels with transom-mounted outboards you can easily figure out which type of outboard you need to get. An electrohydraulic jack plate adjusts the motor height with a switch and can be done while underway.

Outboard Shaft Length Chart. To sum up there is a simple calculator of the shaft length for outboard motors. If the propeller fails to ventilate the motor is mounted to low.