Yamaha 4 Stroke Owners Manual

Maintenance
56
EMU34451Maintenance chart 2
Item ActionsEvery
1000 hours
Exhaust guide/exhaust 
manifoldInspection or replace-
ment as necessary
U6BV10E0.book  Page 56  Friday, July 17, 2009  2:29 PM 

Maintenance
57
EMU28941Greasing
Yamaha grease A (water resistant grease)
Yamaha grease D (corrosion resistant grease; for propeller shaft)
F4, F6
ZMU06764
U6BV10E0.book  Page 57  Friday, July 17, 2009  2:29 PM 

Maintenance
58
EMU39291Cleaning and adjusting spark plug
The spark plug is an important engine compo-
nent. The condition of the spark plug can indi-
cate something about the condition of the
engine. For example, if the center electrode
porcelain is very white, this could indicate an
intake air leak or carburetion problem in that
cylinder. Do not attempt to diagnose any
problems yourself. Instead, take the outboard
motor to a Yamaha dealer. You should peri-
odically remove and inspect the spark plug...

Maintenance
59
material is found in the filters, clean or replace
them. For cleaning or replacement of the fuel
filters, consult a Yamaha dealer.
EMU40140Inspecting idle speed
NOTICE
ECM02230
When checking the engine idle speed,
make sure to supply water to the cooling
water passages by placing the outboard
motor in the water or by using a flushing
attachment or test tank.
To check the engine idle speed, a diagnostic
tachometer is required. For checking or ad-
justment of the engine idle speed, consult...

Maintenance
60
7. If the oil changer is not available, remove
the drain screw while holding a container
under the drain hole. Let the oil drain
completely. Wipe up any spilled oil imme-
diately.
8. If the drain screw was removed, install a
new washer and drain screw, and then
tighten the drain screw.
9. Add the correct amount of oil through the
filler hole. NOTICE: Overfilling the oil
tank could cause leakage or damage.
If the oil level is above the upper mark,
extract oil until the oil is between the...

Maintenance
61
16. Dispose of used oil according to local
regulations.
TIP:

For more information on the disposal of
used oil, consult your Yamaha dealer.

Change the oil more often when operating
the engine under adverse conditions such
as extended trolling.
17. Install the top cowling.
EMU39771Checking connector and lead
For checking of the following items for the
connectors and leads, consult a Yamaha
dealer.

Check that each connector is connected
securely.

Check that each ground lead is secured...

Maintenance
62
3. Remove the propeller and thrust washer.EMU30672Installing propellerEMU39322Spline models
NOTICE
ECM00500
Be sure to use a new cotter pin and bend
the ends over securely. Otherwise the pro-
peller could come off during operation and
be lost.
1. Apply Yamaha grease D (corrosion resis-
tant grease) into the propeller shaft.
2. Install the thrust washer and propeller
onto the propeller shaft. NOTICE: Be
sure to install the thrust washer before
installing the propeller, otherwise the
lower...

Maintenance
63
4. Remove the oil level plug and gasket to
allow the oil to drain completely.
NOTICE: Check the used oil after it
has been drained. If the oil is milky or
contains a large amount of metal par-
ticles, the gear case may be damaged.
Have a Yamaha dealer check and re-
pair the outboard motor.
 [ECM00712]
TIP:
For disposal of used oil, consult your Yamaha
dealer.
5. Using a flexible or pressurized filling de-
vice, inject the gear oil into the gear oil
drain screw hole.6. Put a new gasket on...

Trouble Recovery
64
EMU39523
Troubleshooting
This section describes the likely causes and
remedies for problems, such as those in the
fuel, compression, and ignition systems, poor
starting, and loss of power. Please note that
all of the items in this section may not apply to
your model.
If your outboard motor requires repair, bring it
to a Yamaha dealer.
Engine will not start.
Q. Is fuel tank empty?
A. Fill tank with clean, fresh fuel.
Q. Is fuel contaminated or stale?
A. Fill tank with clean, fresh...

Trouble Recovery
65
A. Loosen air vent screw.
Q. Is choke knob pulled out?
A. Return to home position.
Q. Is carburetor clogged?
A. Have serviced by a Yamaha dealer.
Q. Is fuel joint connection incorrect?
A. Connect correctly.
Q. Is throttle cable adjustment incorrect?
A. Have serviced by a Yamaha dealer.
Engine power loss.
Q. Is propeller damaged?
A. Have propeller repaired or replaced.
Q. Is propeller pitch or diameter incorrect?
A. Install correct propeller to operate outboard
at its recommended speed...