Breaking In Engine; Procedure For 4-Stroke Models; Preoperation Checks; Fuel - Yamaha F20A Owner's Manual

board (if packed). For details, consult
your Yamaha dealer.
EWM00650
WARNING
Avoid using bolts, nuts or washers other
than those contained in the engine pack-
aging. If used, they must be of at least the
same quality of material and strength and
must be tightened securely. After tighten-
ing, test run the engine and check their
tightness.
1
1. Bolts
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
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
EWM00080
WARNING
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
could occur.
ECM00120
ZMU02637 CAUTION:
Do not start the engine out of water. Over-
heating and serious engine damage can
occur.
EMU27110

Fuel

Check to be sure you have plenty of fuel
G
for your trip.
Make sure there are no fuel leaks or gaso-
G
line fumes.
Check fuel line connections to be sure they
G
are tight (if equipped Yamaha fuel tank or
boat tank).
Be sure the fuel tank is positioned on a se-
G
cure, flat surface, and that the fuel line is
not twisted or flattened, or likely to contact
sharp objects (if equipped Yamaha fuel
tank or boat tank).
EMU27130

Controls

Check throttle, shift, and steering for prop-
G
Operation

Preoperation checks

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