Battery Specifications; Without A Rectifier Or Rectifier Regulator; Propeller Selection - Yamaha F20A Owner's Manual

General information
which meets the following specifications.
EMU25720

Battery specifications

Minimum cold cranking amps (CCA/EN):
F20AE 347.0 A
F20AET 347.0 A
F25AE 347.0 A
F25AET 347.0 A
FT25BET 347.0 A
Minimum rated capacity (20HR/IEC):
F20AE 40.0 Ah
F20AET 40.0 Ah
F25AE 40.0 Ah
F25AET 40.0 Ah
FT25BET 40.0 Ah
EMU25730
Without a rectifier or Rectifier
Regulator
ECM01090
CAUTION:
A battery cannot be connected to models
that do not have a rectifier or Rectifier
Regulator.
If you wish to use a battery with the models
without a rectifier or Rectifier Regulator, in-
stall an optional Rectifier Regulator.
Using a maintenance-free battery with the
above models can shorten the life of the bat-
tery significantly.
Install an optional Rectifier Regulator or use
accessories rated to withstand 18 volts or
higher with the above models. Consult your
Yamaha dealer for details on installing an
optional Rectifier Regulator.
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
affect performance and could also seriously
6
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 ap-
plication.
1. Propeller diameter in inches
2. Propeller pitch in inches
3. Type of propeller (propeller mark)
x -
1 2 3
ZMU04604