Yamaha F250 Owners Manual

Maintenance
55
CAUTION:
ECM01510

Do not use any tools to remove or install
the spark plug cap, otherwise the igni-
tion coil coupler may get damaged. The
spark plug cap may be difficult to re-
move because the rubber seal on the
end of the cap fits tightly. To remove the
spark plug cap, simply twist it back and
forth while pulling it out; to install it,
twist it back and forth while pushing it
in.

Be sure to use the specified spark plug,
otherwise the engine may not operate
properly.
The spark plug is...

Maintenance
56
5. When fitting the plug, wipe off any dirt
from the threads, and then screw it in to
the correct torque.
NOTE:
If a torque-wrench is not available when you
are fitting a spark plug, a good estimate of the
correct torque is 1/4 to 1/2 turn past finger-
tight. Have the spark plug adjusted to the cor-
rect torque as soon as possible with a torque-
wrench.
6. Install the spark plug cap and tighten the
bolts.
7. Install the ignition coil cover and tighten
the bolts.
EMU28962Checking fuel...

Maintenance
57
CAUTION:
ECM01240
Change the engine oil after the first 10
hours of operation, and every 100 hours or
at 6-month intervals thereafter. Otherwise
the engine will wear quickly.
NOTE:
Change the engine oil when the oil is still
warm.
The engine oil can be extracted with an oil
changer (recommended), or drained by re-
moving the oil drain screw.
Extracting the oil with an oil changer (normal
oil change)
1. Put the outboard motor in an upright po-
sition (not tilted).
2. Pull out the dipstick...

Maintenance
58
7. Start the engine and make sure that the
low oil pressure warning indicator re-
mains off. Also, make sure that there are
no oil leaks.
CAUTION:
ECM01620
If the low oil pressure warning indicator
comes on or if there are oil leaks, stop the
engine and find the cause. Continued op-
eration with a problem could cause severe
engine damage. Consult your Yamaha
dealer if the problem cannot be located
and corrected.
8. Turn off the engine and wait 3 minutes.
Recheck the oil level using the...

Maintenance
59
2. Tilt the outboard motor 5–10 degrees up,
then turn it entirely to the starboard side
until the drain screw is directly below.
3. Prepare a suitable container that holds a
larger amount than the engine oil capaci-
ty. Loosen and remove the drain screw
while holding the container under the
drain hole. Let the oil drain completely.
Wipe up any spilled oil immediately.
4. Put a new gasket on the oil drain screw.
Apply a light coat of oil to the gasket and
install the drain screw.
NOTE:

If...

Maintenance
60
EMU29153Checking power trim and tilt system
WARNING
EWM00430

Never get under the lower unit while it is
tilted, even when the tilt support lever is
locked. Severe injury could occur if the
outboard motor accidentally falls.

Make sure no one is under the outboard
motor before performing this test.
1. Check the power trim and tilt unit for any
sign of oil leaks.
2. Operate each of the power trim and tilt
switches on the remote control and en-
gine bottom cowling (if equipped) to
check that...

Maintenance
61
EMU29171Checking propeller
WARNING
EWM00321
You could be seriously injured if the en-
gine accidentally starts when you are near
the propeller.

Before inspecting, removing, or install-
ing the propeller, remove the spark plug
caps from the spark plugs. Also, place
the shift control in neutral, turn the main
switch to “” (off) and remove the key,
and remove the lanyard from the engine
stop switch. Turn off the battery cut-off
switch if your boat has one.

Do not use your hand to hold the...

Maintenance
62
EMU30660Removing the propellerEMU29194Spline models
1. Straighten the cotter pin and pull it out us-
ing a pair of pliers.
2. Remove the propeller nut, washer, and
spacer (if equipped).
3. Remove the propeller and thrust washer.
EMU30670Installing the PropellerEMU29242Spline models
WARNING
EWM00770
On counter rotation models, be sure to
use a propeller intended for counterclock-
wise rotation. These propellers are identi-
fied with the letter “L” after the size
indication on the propeller....

Maintenance
63
EMU31910Changing gear oil
WARNING
EWM00800

Be sure the outboard motor is securely
fastened to the transom or a stable
stand. You could be severely injured if
the outboard motor falls on you.

Never get under the lower unit while it is
tilted, even when the tilt support lever or
knob is locked. Severe injury could oc-
cur if the outboard motor accidentally
falls.
1. Tilt the outboard motor so that the gear oil
drain screw is at the lowest point possi-
ble.
2. Place a suitable container...

Maintenance
64
NOTE:
For disposal of used oil, consult your Yamaha
dealer.
6. With the outboard motor in a vertical po-
sition, and using a flexible or pressurized
filling device, inject the gear oil into the
gear oil drain screw hole.
7. Put a new gasket on the oil level plug.
When the oil begins to flow out of the oil
level plug hole, insert and tighten the oil
level plug.
8. Put a new gasket on the gear oil drain
screw. Insert and tighten the gear oil
drain screw.
9. Securely install the cooling water...