Yamaha XF375 Owner's Manual page 17

Battery isolator
Your outboard motor is capable of charging an accessory
battery separate from the starting battery using an optional
isolator lead. Contact your Yamaha dealer for installation of
an optional isolator lead with over-current protection.
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Propeller selection
Next to selecting an outboard motor, selecting the right pro-
peller is one of the most important purchasing decisions a
boater can make. The type, size, and design of your propel-
ler have a direct impact on acceleration, top speed, fuel
economy, and even engine life. Yamaha designs and manu-
factures propellers for every Yamaha outboard motor and
every application.
Your Yamaha dealer can help you select the right propeller
for your boating needs. Select a propeller that will allow the
engine to reach the middle or upper half of the operating
range at full throttle with the maximum boatload. Generally,
select a larger pitch propeller for a smaller operating load
and a smaller pitch propeller for a heavier load. If you carry
loads that vary widely, select the propeller that lets the en-
gine run in the proper range for your maximum load but re-
member that you may need to reduce your throttle setting to
stay within the recommended engine speed range when car-
rying lighter loads.
Yamaha recommends to use a propeller suitable for the
"Shift Dampener System (SDS)". For further information,
consult your Yamaha dealer.
To check the propeller, see page 57.
Propeller example
1. Propeller diameter in inches
2. Propeller pitch in inches
3. Type of propeller (propeller mark)
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Counter rotation models
Standard outboard motors rotate clockwise. Counter rota-
tion models rotate counterclockwise and are typically used
in multiple motor setups.
On counter rotation models, be sure to use a propeller in-
tended for counterclockwise rotation. These propellers are
identified with the letter "L" after the size indication on the
propeller. WARNING! Never use a standard propeller with
a counter rotation motor, or a counter rotation propeller
with a standard motor. Otherwise the boat could go in
the direction opposite of that expected (for example, re-
verse instead of forward), which could lead to an acci-
dent.
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1
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Specifications and requirements
For instructions on propeller removal and installation, see
page 57.
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Start-in-gear protection
Yamaha outboard motors or Yamaha-approved digital elec-
tronic control units are equipped with start-in-gear protec-
tion device(s). This feature permits the engine to be started
only when it is in neutral. Always select neutral before start-
ing the engine.
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Engine oil requirements
Select an oil grade according to the average temperatures in
the area where the outboard motor will be used.
Recommended engine oil:
YAMALUBE 4M FC-W or 4-stroke
outboard motor oil
Recommended engine oil grade 1:
SAE 10W-30/10W-40/5W-30
API SG/SH/SJ/SL
Recommended engine oil grade 2:
SAE 15W-40/20W-40/20W-50
API SH/SJ/SL
Engine oil quantity (without oil filter
replacement):
7.5 L (7.93 US qt, 6.60 Imp.qt)
Engine oil quantity (with oil filter re-
placement):
7.8 L (8.24 US qt, 6.86 Imp.qt)
If oil grades listed under Recommended engine oil grade 1
are not available, select an alternative oil grade listed under
Recommended engine oil grade 2.
Recommended engine oil grade 1
-4 14 32 50
-20 -10 0 10
10W–30
10W–40
5W–30
Recommended engine oil grade 2
-4 14 32 50
-20 -10 0 10
SAE API
68 86 104 122˚F
20 30 40 50˚C
SG
SH
SJ
SL
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SAE API
68 86 104 122˚F
20 30 40 50˚C
15W–40
SH
SJ
20W–40
SL
20W–50
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