Owner`s manual

1-2
Section 1 Propulsion Systems
C 260
2-cycle outboard motors are lubricated by an
oil injection system. Always monitor the oil
level before each cruise by checking the
gauge in the helm or visually checking the oil
level using the reference marks on the
tanks. When additional oil is needed, use
only the type of oil specified by the engine
manufacturer. Refer to the engine owner’s
manual for oil specifications and additional
information on the oil injection system. Refer
to the Fuel System chapter.
1.4 Engine Cooling System
Outboard engines are raw water (sea water)
cooled. Water is pumped through the water
inlets, circulated through the engine block,
and relinquished with the exhaust gases
through the propeller hub. The water pump
uses a small impeller made of synthetic rub-
ber. The impeller and water pump cannot
run dry for more than a few seconds. In most
outboard motors, some cooling water is
diverted through ports below the engine
cowling. This allows the operator to visually
check the operation of the cooling system.
When the engine is started, always check for
a steady stream of water coming out of
those ports.
If the boat is used in salt or badly polluted
water, the engines should be flushed after
each use. Refer to the engine owner’s man-
ual for the proper engine flushing procedure.
1.5 Propellers
The propellers convert the engine’s power
into thrust. They come in a variety of styles,
diameters and pitches. The one that will best
suit the needs of your Pursuit will depend
somewhat on your application and expected
average load. Propeller sizes are identified
by two numbers stamped on the prop in
sequence. The 1st number in the sequence
(example 14 x 21) is the diameter of the pro-
peller, 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.
1.6 Engine Instrumentation
The helm station is equipped with a set of
engine instruments and alarms. These
instruments allow the operator to monitor the
engines’ operational conditions. Close
observation of these instruments allows the
operator to operate the engines at the most
efficient level and could save them from seri-
ous costly damage. The instrumentation is
unique to the type of outboard motors
installed on your Pursuit. Some or all of the
following gauges may be present.
This model may be equipped with
Yamaha Command Link Integrated Infor-
mation System®. Please refer to the
Yamaha manuals for information on the
operation of this system.
Tachometer
The tachometer displays the speed of the
engine in revolutions per minute (RPM). This
speed is not the boat speed or necessarily
the speed of the propeller. The tachometer
may not register zero with the key in the
“OFF” position.
! NOTICE
Always monitor the oil level and only
use the type of oil specified by the
engine manufacturer.
! CAUTION
Never run an outboard motor without
water flowing to the water pump. Seri-
ous damage to the water impeller or
engine could result.