Yamaha 115D Owner's Manual download pdf (Page 30)

Operation

25

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-

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 dealer or boat

manufacturer for further information on de-

termining the proper mounting height.

●

For instructions on setting the trim angle of

the outboard motor, see page 34.

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

life.

CAUTION:

ECM00140

●

Failure to follow the break-in procedure

could result in reduced engine life or

even severe engine damage.

●

Premix fuel must be used during break-

in in addition to oil in the oil injection

system.

EMU27060

Gasoline and engine oil mixing chart

(50:1)

CAUTION:

ECM00150

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

ZMU01762

1. : Engine oil

2. : Gasoline

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