Replacement Parts; Severe Operating Conditions - Yamaha F4A Owner's Manual

Maintenance
tor before operation.
Maintenance, replacement, or repair of
the emission control devices and sys-
tems on models affixed with an emission
control label may be performed by any
marine engine repair establishment or in-
dividual. All warranty repairs, however,
including those to the emission control
system, must be performed by an autho-
rized 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
passengers. Yamaha genuine parts and ac-
cessories 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-
●
mum engine speed (rpm) for many hours
Operating continuously at a low engine
●
speed (rpm) for many hours
Brief periods of rapid acceleration and de-
●
celeration followed by engine shut off be-
fore the engine has reached proper
operating temperature
Frequent quick acceleration and decelera-
●
tion
Frequent shifting
●
Frequently starting and stopping the en-
●
gine(s)
Operation that fluctuates often between
●
light and heavy cargo loads
Outboard motors operating under any of
45
these above conditions require more fre-
quent maintenance. Yamaha recommends
that you do this service twice as often as
specified in the maintenance chart. For ex-
ample, if a particular service should be done
at 50 hours, do it instead at 25 hours. This
will help prevent more rapid deterioration of
engine components.