Operation

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 engine 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.

ZMU01762

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 32.

EMU30172

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 ensure proper performance and longer engine

life.

ECM00800

CAUTION:

Failure to follow the break-in procedure could result in reduced engine life or even severe engine damage.

EMU27080

Procedure for 4-stroke models

Run the engine under load (in gear with a propeller installed) as follows.

1.For the first hour of operation:

Run the engine at 2000 r/min or at ap- proximately half throttle.

2.For the second hour of operation:

Run the engine at 3000 r/min or at ap- proximately three-quarter throttle.

3.For the next eight hours of operation: Avoid continuous operation at full throt- tle for more than five minutes at a time.

4.After the first 10 hours:

Operate the engine normally.

EMU27101

Preoperation checks

EWM00080

WARNING

If any item in the preoperation check is not working properly, have it inspected and repaired before operating the outboard motor. Otherwise an accident could occur.

ECM00120

CAUTION:

Do not start the engine out of water. Overheating and serious engine damage can occur.

EMU27110

Fuel

●Check to be sure you have plenty of fuel for your trip.

●Make sure there are no fuel leaks or gaso- line fumes.

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