Periodic Maintenance; Replacement Parts; Severe Operating Conditions - Yamaha F150D Owner's Manual

Maintenance
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Periodic maintenance

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WARNING
These procedures require mechanical
skills, tools, and supplies. If you do not
have the proper skills, tools, or supplies to
perform a maintenance procedure, have a
Yamaha dealer or other qualified mechan-
ic do the work.
The procedures involve disassembling the
motor and exposing dangerous parts. To
reduce the risk of injury from moving, hot,
or electrical parts:
 Turn off the engine and keep the key(s)
and engine shut-off cord (lanyard) with
you when you perform maintenance un-
less otherwise specified.
 The power trim and tilt switches operate
even when the ignition key is off. Keep
people away from the switches whenev-
er working around the motor. When the
motor is tilted, keep away from the area
under it or between it and the clamp
bracket. Be sure no one is in this area
before operating the power trim and tilt
mechanism.
 Allow the engine to cool before handling
hot parts or fluids.
 Always completely reassemble the mo-
tor before operation.
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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.
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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
 Operating without sufficient time for engine
to warm up and cool down
 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
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 en-
gine components.