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motor greatly affects the water resistance. If
the mounting height is too high, cavitation
tends to occur, thus reducing the propulsion;
and if the propeller tips cut the air, the engine
speed will rise abnormally and cause the en-
gine to overheat. If the mounting height is too
low, the water resistance will increase and
thereby reduce engine efficiency. Mount the
outboard motor so that the anti-cavitation
plate is in alignment with the bottom of the
boat.
NOTE:
The optimum mounting height of the out-
G
board motor is affected by the boat/motor
combination and the desired use. Test
runs at different heights can help deter-
mine the optimum mounting height. Con-
sult
your
Yamaha
manufacturer for further information on de-
termining the proper mounting height.
For instructions on setting the trim angle of
G
the outboard motor, see page 35.
EMU27020
Breaking in engine
Your new engine requires a period of break-
in to allow mating surfaces of moving parts to
wear in evenly. Correct break-in will help en-
sure proper performance and longer engine
ZMU01762
dealer
or
boat
life.
ECM00140
CAUTION:
Failure to follow the break-in procedure
G
could result in reduced engine life or
even severe engine damage.
Premix fuel must be used during break-
G
in in addition to oil in the oil injection
system.
EMU27060
Gasoline and engine oil mixing chart
(50:1)
1.
: Gasoline
2.
: Engine oil
ECM00150
CAUTION:
Be sure to mix gasoline and oil complete-
ly, otherwise the engine may be dam-
aged.
EMU30310
Procedure for oil injection models
Run the engine under load (in gear with a
propeller installed) as follows.
1.
First 10 minutes:
Run the engine at the lowest possible
speed. A fast idle in neutral is best.
2.
Next 50 minutes:
Do not exceed half throttle (approxi-
mately 3000 r/min). Vary engine speed
occasionally. If you have an easy-plan-
ing boat, accelerate at full throttle onto
plane, then immediately reduce the
Operation
26
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