2004 YAMAHA YFM80R engine

8-15
Engine oil replacement
1. Place the ATV on a level surface.
2. Warm up the engine for several minutes
and stop it.
3. Place a container under the engine.
4. Remove the dipstick and drain bolt to drain
the oil.
5. Inspect the O-ring and replace if damaged.
6. Install the drain bolt and tighten to specifi-
cation.
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1. Drain bolt1. Bouchon de vidange1. Perno de drenaje
Tightening torque
Drain bolt:
20 Nm (2.0 m0kgf)
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8-17
7. Fill the engine with oil and install the dip-
stick.
cC
Be sure no foreign material enters the
crankcase.
8. Warm up the engine for several minutes at
idle speed. Check for oil leakage while
warming up.
cC
If oil leakage is found, stop the engine imme-
diately and check for the cause.
Recommended oil:
See page 10-2.
Oil quantity:
Periodic oil change:
0.8 L
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8-23
EBU11820
Spark plug inspection
The spark plug is an important engine compo-
nent and is easy to inspect. The condition of the
spark plug can indicate the condition of the
engine.
For example, a very white center electrode
porcelain color could indicate an intake air leak
or carburetion problem for that cylinder. Do not
attempt to diagnose such problems yourself.
Instead, take the ATV to a Yamaha dealer. You
should periodically remove and inspect the
spark plug because heat and deposits will cause
the spark plug to slowly break down and erode.
If electrode erosion becomes excessive, you
should replace the spark plug with one of the
proper type.
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w
q
1. Fastener 2. Air filter element1. Attache 2. Elément du filtre à air1. Sujeción 2. Elemento filtrante de aire
8-29
2. Remove the air filter case cover by
unhooking the fasteners.
3. Remove the air filter element by unhooking
the fastener.
4. Wash the air filter element gently but thor-
oughly in solvent.
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Always use parts cleaning solvent to clean
the air filter element. Never use low flash
point solvents or gasoline to clean the air fil-
ter element because the engine could catch
fire or explode.
5. Squeeze the excess solvent out of the air
filter element and let it dry.
cC
Do not twist the air filter element when
squeezing it.
6. Inspect the air filter element. If damaged,
replace it.
7. Apply Yamaha foam air filter oil or other
quality foam air filter oil to the air filter ele-
ment. If foam air filter oil is not available,
SAE10W30 motor oil may be used.
q
ww
1. Air filter case cover 2. Fastener (×4)1 . Couvercle du boîtier de filtre à air 2 .Attache (×4)1.Cubierta de la caja del filtro de aire2. Sujeción (×4)
5TH-9-62 8 4/8/03 9:05 PM Page 8-29

8-31
NOTE:
The air filter element should be wet but not drip-
ping.
8. Install the air filter element.
9. Install the air filter case cover by hooking
the fasteners onto the air filter case.
10. Install the front cover by installing the bolts.
NOTE:
The air filter element should be cleaned every
20–40 hours. It should be cleaned and lubricat-
ed more often if the machine is operated in
extremely dusty areas. Each time air filter ele-
ment maintenance is performed, check the air
inlet of the air filter case for obstructions. Check
the air cleaner rubber joint to the carburetor and
manifold fittings for an airtight seal. Tighten all
fittings securely to avoid the possibility of unfil-
tered air entering the engine.
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8-33
cC
Never operate the engine with the air filter ele-
ment removed. This will allow unfiltered air to
enter the engine, causing rapid engine wear
and possible engine damage. Additionally,
operation without the filter element will affect
carburetor jetting with subsequent poor per-
formance and possible engine overheating.
EBU01035
Air intake restrictor plate removal
To obtain full engine performance capability,
removing the air intake restrictor plate is
required.
1. Remove the air filter element. (See page
8-27 for removal and installation procedures.)
2. Remove the air intake restrictor plate.
NOTE:
Store the air intake restrictor plate with the
owner’s manual so you can install it whenever
you want to reduce the top speed available.
3. Install the air filter element.
q
1. Air intake restrictor plate1. Cache réducteur d’air admis1. Placa de restricción de admisión de aire
5TH-9-62 8 4/8/03 9:05 PM Page 8-33

EBU00296
Carburetor adjustment
The carburetor is a vital part of the engine and
requires very sophisticated adjustment. Most
adjusting should be left to a Yamaha dealer who
has the professional knowledge and experience
to do so. However, the idling speed may be per-
formed by the owner as a part of the usual main-
tenance routine.
cC
The carburetor was set at the Yamaha facto-
ry after many tests. If the settings are dis-
turbed by someone without sufficient techni-
cal knowledge, poor engine performance and
damage may result.
8-35
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8-37
EBU01143
Idle speed adjustment
NOTE:
A diagnostic tachometer must be used for this
procedure.
1. Start the engine and warm it up for a few
minutes at approximately 1,000 to 2,000
r/min. Occasionally rev the engine to 4,000
to 5,000 r/min. The engine is warm when it
quickly responds to the throttle.
2. Connect the tachometer and set the idle to
the specified idling speed by adjusting the
throttle stop screw. Turn the screw in direc-
tion ato increase the engine speed, and
in direction bto decrease the engine
speed.q
a b
1. Throttle stop screw1. Vis de butée de papillon1. Tornillo tope del acelerador
Specified idle speed:
1,700–1,900 r/min
5TH-9-62 8 4/8/03 9:05 PM Page 8-37