Severe Operating Conditions - Yamaha F25D Owner's Manual

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EMU34152

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
engine components.
Maintenance
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