Yamaha F50D 用户手册
Operation
26
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.
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.
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 en-
sure proper performance and longer engine
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:
ECM00800
Failure to follow the break-in procedure
could result in reduced engine life or
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.
propeller installed) as follows.
1.
For the first hour of operation:
Run the engine at 2000 r/min or at ap-
proximately half throttle.
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.
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.
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.
Operate the engine normally.
EMU27101
Preoperation checks
WARNING
EWM00080
If any item in the preoperation check is
not working properly, have it inspected
and repaired before operating the out-
board motor. Otherwise an accident
not working properly, have it inspected
and repaired before operating the out-
board motor. Otherwise an accident
could occur.
CAUTION:
ECM00120
Do not start the engine out of water. Over-
heating and serious engine damage can
heating and serious engine damage can
occur.
EMU27110
Fuel
●
Check to be sure you have plenty of fuel
for your trip.
for your trip.
●
Make sure there are no fuel leaks or gaso-
line fumes.
line fumes.
ZMU01762