10
trim. With a light load on smooth water, the engine should reach its manufacturer’s rated
maximum operating RPM at wide open throttle (WOT) and maximum trim. If it does not, you may
have a propeller which has too much pitch. If it goes beyond the maximum recommended RPM
range, you may have too little pitch. Neither condition is good for the engine. You will get shorter
engine life and poorer performance than your boat and motor were designed to provide.
If your boat came from the factory with a propeller selected by EdgeWater and Yamaha
Engineering, it should already be optimized for the performance of your boat. Before
changing the pitch or diameter of your propeller, always check with your dealer to
determine how the changes will affect your boat and engine performance. Certain modifications
such as bottom paint or options that affect weight balance and/or wind resistance may lower peak
rpm. Always check with your dealer first if optimum rpm cannot be attained.
3.4 Engine Power Tilt and Trim
The power tilt and trim system on your outboard provides the ability to optimize the running
angle of your EdgeWater 245CX 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
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 operator’s 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 tachometers 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 engine and your EdgeWater 245CX. By monitoring your tachometer
as
you
operate your EdgeWater, you will find RPM ranges that work better in certain
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