39
Propulsion System
3. Press the ush system start button in the tran-
som panel to select the desired ush time and
start the sequential ushing process.
4. The system ushes the rst motor for the select-
ed time, then automatically moves to the next.
5. The system automatically shuts o once all mo-
tors are ushed.
3.6 Propellers
The propellers convert the engine’s power into
thrust. They come in a variety of styles, diameters
and pitches. All boats powered by Yamaha engines
are equipped with Yamaha propellers. The propel-
lers that will best suit the needs of your boat will
depend somewhat on your application and expected
average load. Propeller sizes are identied by two
numbers stamped on the prop in sequence. The 1st
number in the sequence (example 14” x 21”) is the
diameter of the propeller and the 2nd number is the
pitch. Pitch is the theoretical distance traveled by
the propeller in each revolution.
Always repair or replace a propeller immediately if it
has been damaged. A damaged and therefore out
of balance propeller can cause vibration that can be
felt in the boat and could damage the engine gear
assembly. Refer to the engine owner’s manual for
information on propeller removal and installation.
3.7 Performance Issues & Propellers
It is extremely important that the boat is propped
to run at or very near the recommended top RPM
with an average load. If the top RPM is above or
below the recommend range, the propellers must be
changed to prevent loss of performance and possible
engine damage.
Your boat is equipped from the factory with counter
rotating engines that are mounted to achieve quicker
planning and optimum performance. Therefore, the
left rotation engine is mounted on the port side of
the transom and the right rotation engine is mounted
on the starboard side.
Notice:
Before changing propellers to correct boat per-
formance problems, be sure other factors such
as engine tuning, bottom and running gear
growth, etc. are not the source of performance
changes. Always be sure the load conditions
are those normally experienced, before chang-
ing propellers.
Your boat was shipped with propellers that typically
provide optimum performance for your boat. How-
ever there are factors that can aect performance
and propeller requirements.
Some are as follows:
• You should be sure the load conditions are
those normally experienced. If the boat ran
in the required RPM range when it was new
and you have not added any additional gear or
heavy equipment and have not damaged the
propellers, there is a good chance the propellers
are not the problem.
• The addition of heavy equipment like a tower,
life rafts, additional coolers, etc., will cause
additional load on the engines. Consequently,
dierent propellers may be required.
• Boats operated at high altitudes (above 2000
feet). Engines operated at high altitudes will
not be able to develop as much horsepower as
they do at or near sea level. Consequently,
dierent propellers may be required.
Notice:
Outboard engines can be damaged and the
warranty void if the boat is not propped
correctly. Always consult your Everglades
dealer or authorized engine service dealer
when making changes to the propellers or
if the boat does not run near the top recom-
mended RPM.
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