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Do not attempt control adjustments unless you are very familiar with their function, operation and
adjustment. Failure to properly adjust the system components can adversely affect your boat’s
performance and safety. Mis-adjustment can also cause severe control, engine or lower unit
damage.
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Most outboard engines are cooled by water taken in through ports in the lower part of the drive
section. Make sure these ports are free of debris or other items that might cause the flow to be
restricted. Maintain a routine vigilance to see that the visual inspection streams have a steady
flow of water. If they do not, shut down the engine to see if they are clogged or if there is a more
serious problem. Be especially watchful if you have gone through an area of vegetation or
shallow water as the intake ports can become clogged with weeds, dirt or other debris.
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A turning propeller moves the boat through the water, forward or backward. They should always
be clean and free from nicks or dings, which can adversely affect performance. Your dealer can
assist you in the proper selection of a propeller for your boat. This selection is based on the
horsepower of the engine and its relationship to the size and weight of the boat.
Propeller sizes are determined by two numbers, which appear on different propellers at various
locations. They are listed in sequence, for example 13 x 17. The first number is the diameter of
the propeller and the second is the pitch. Pitch is the theoretical distance the propeller moves
through the water with each complete revolution, the larger the number the greater the theoretical
movement. It also follows that the larger the number the greater horsepower is required to turn it.
With a load which is “normal”, or usual for your boating activities, the engine should be able to
reach its maximum operating RPM range at wide open throttle (WOT). 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 that 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.
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