Propeller Selection - Yamaha 25B Manual Del Propietário

GB
EMU01395

PROPELLER SELECTION

The performance of your outboard motor will
be critically affected by your choice of pro-
peller, as an incorrect choice could adversely
affect performance and could also seriously
damage the motor. Engine speed depends
on the propeller size and boat load. If engine
speed is too high or too low for good engine
performance, this will have an adverse effect
on the engine.
Yamaha outboard motors are fitted with pro-
pellers chosen to perform well over a range
of applications, but there may be uses where
a propeller with a different pitch would be
more appropriate. For a greater operating
load, a smaller-pitch propeller is more suit-
able as it enables the correct engine speed
to be maintained. Conversely, a larger-pitch
propeller is more suitable for a smaller oper-
ating load.
Yamaha dealers stock a range of propellers,
and can advise you and install a propeller on
your outboard that is best suited to your
application.
NOTE:
At full throttle and under a maximum boat
load, the engine's rpm should be within the
upper half of the full throttle operating range,
as listed in "SPECIFICATIONS" on page 4-1.
Select a propeller which fulfills this require-
ment.
If operating under conditions which allow the
engine's rpm to rise above the maximum
recommended range (such as light boat
loads), reduce the throttle setting to maintain
the rpm in the proper operating range.
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