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3.4 Engine Power Tilt and Trim
The power tilt and trim system on your outboard(s) provides the ability to optimize the running
angle of your EdgeWater 388CC to allow for load and sea conditions. Moving the outboard lower
unit toward the transom is generally referred to as trimming “in”, while moving the outboard lower
unit away from the transom is referred to trimming “out”. It is generally best to have the engine(s)
trimmed in for acceleration from displacement to planning mode. This brings the bow down and
requires less fuel and effort on the engine’s part to plane off the hull. Once on plane, the engine
should be trimmed “out” to optimize performance and minimize fuel consumption.
The first 20°
of movement aft of the transom are referred to as trim and is the area generally
used to operate the boat while on plane. The area beyond the first 20° is referred to as tilt and is
usually reserved for operating in shallow water or at idle speeds only.
While running under normal conditions, the bow should be in a 3°
to 5° up angle to maximize the
hull’s ride and performance. When sea conditions are rougher than normal, bringing the bow
slightly down may improve the ride and will also allow the boat to remain on plane at a lower
speed.
Inspect hoses and cables at the engine before each use. Any worn or cracked components
should be replaced immediately.
3.5 Engine Instrumentation
The following is presented to familiarize you with the instruments, which may be on your boat.
Every boat is not equipped with full instrumentation.
All factory installed Yamaha® engines include Yamaha’s digital multifunction tachometer
and speedometer. Refer to your engine operators’ manual for use details.
Tachometer
The tachometer displays the number of revolutions per minute (RPM) the engine is turning.
There is a designed operation RPM range for the engine. Become familiar with the operating
range of your engine and its operating characteristics. The tachometer is designed to aid the
boater to assure the engine performs within that designed range. The tachometer can be used to
better understand the performance of your engines and your EdgeWater 388CC. By monitoring
your tachometer as you operate your EdgeWater 388CC, you will find RPM ranges that work
better in certain sea and load conditions. Be alert the tachometer operation may provide an early
indication of difficulty, before it becomes irreversible.
Speedometer
The speedometer indicates the boat speed in miles per hour. Some types work using a
spinning wheel to determine the boat speed. Their accuracy can vary from the actual over the
bottom speed due to many factors. Other boat speedometers calculate the speed by amount of
pressure the moving water forces into a “pitot” tube. And some other speedometers use a GPS
sensor. These gauges should only be used as indicators of approximate speed and not used as
absolute speed indicators. NOTE: The Yamaha® F250 engines use a pitot tube built into the
lower unit while the F300 and F350 engines require a GPS input for speed. In the event that
erroneous speed-readings appear, it is likely caused by debris clogging the pitot tube. Consult
with your dealer on methods to clean the tube and restore normal operation.
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