Yamaha F25 User Manual download pdf (Page 15)

General information

10

CAUTION:

ECM01050

All 4-stroke engines are shipped from the

factory without engine oil.

EMU25742

Propeller selection

The performance of your outboard motor will

be critically affected by your choice of propel-

ler, as an incorrect choice could adversely af-

fect 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 suitable as it

enables the correct engine speed to be main-

tained. Conversely, a larger-pitch propeller is

more suitable for a smaller operating 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 appli-

cation.

NOTE:

Select a propeller which will allow the engine

to reach the middle or upper half of the oper-

ating range at full throttle with the maximum

boat load. If operating conditions such as light

boat loads then allow the engine r/min to rise

above the maximum recommended range, re-

duce the throttle setting to maintain the en-

gine in the proper operating range.

For instructions on propeller removal and in-

stallation, see page 40.

ZMU01710

1. Propeller diameter in inches

2. Propeller pitch in inches

3. Type of propeller (propeller mark)

ZMU04604

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