Replacement Parts; Severe Operating Conditions - Yamaha 9.9F Owner's Manual

Always completely reassemble the mo-
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tor before operation.
Maintenance, replacement, or repair of the
emission control devices and systems on
models affixed with an emission control
label may be performed by any marine en-
gine repair establishment or individual. All
warranty repairs,
those to the emission control system,
must be performed by an authorized
Yamaha marine dealership.
EMU28511

Replacement parts

If replacement parts are necessary, use only
genuine Yamaha parts or parts of equivalent
design and quality. Any part of inferior quality
may malfunction, and the resulting loss of
control could endanger the operator and pas-
sengers. Yamaha genuine parts and acces-
sories are available from your Yamaha
dealer.
EMU34150

Severe operating conditions

Severe operating conditions involve one or
more of the following types of operation on a
regular basis:
Operating continuously at or near maxi-
G
mum engine speed (rpm) for many hours
Operating continuously at a low engine
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speed (rpm) for many hours
Brief periods of rapid acceleration and de-
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celeration followed by engine shut off be-
fore the engine has reached proper
operating temperature
Frequent quick acceleration and decelera-
G
tion
Frequent shifting
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Frequently starting and stopping the en-
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gine(s)
Operation that fluctuates often between
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light and heavy cargo loads
however, including
Outboard motors operating under any of
these above conditions require more frequent
maintenance. Yamaha recommends that you
do this service twice as often as specified in
the maintenance chart. For example, if a par-
ticular service should be done at 50 hours, do
it instead at 25 hours. This will help prevent
more rapid deterioration of engine compo-
nents.
Maintenance
40