engine YAMAHA YFM80R 2002 Service Manual

8-13
EBU00868Engine oil
Engine oil level measurement
1. Place the ATV on a level surface.
2. Warm up the engine for several minutes
and stop it.
3. Remove the dipstick and wipe it off with a
clean rag. Insert the dipstick in the filler
hole without screwing it in.NOTE:
Wait a few minutes until the oil level settles
before checking.4. Remove the dipstick and inspect the oil
level.
5. The oil level should be between the maxi-
mum and minimum marks. If the level is
low, add oil to raise it to the proper level.cCBe sure no foreign material enters the
crankcase.
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1. Dipstick
2. Maximum level mark 3. Minimum level mark1. Jauge
2. Repère de niveau maximum 3. Repère de niveau minimum1. Varilla de medición
2. Marca de máximo 3. Marca de mínimo
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8-15
Engine oil replacement
1. Place the ATV on a level place.
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.cCBe 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.cCIf 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
Total amount:
0.95 L
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8-23
EBU00870Spark 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.wAlways 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.cCDo not twist the air filter element when
squeezing it.6. Inspect the air filter element. If damaged,
replace it.
7. Apply SAE10W30 motor oil to the air filter
element.
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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 aire
2. Sujeción (×4)
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8-31
NOTE:
The air filter element should be wet but not dripping.8. Install the air filter element, the air filter
case cover and the front cover.NOTE:
The air filter element should be cleaned every
20 – 40 hours. It should be cleaned and lubri-
cated 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 air-tight seal. Tighten all
fittings securely to avoid the possibility of unfil-
tered air entering the engine.cCNever operate the engine with the air filter
element removed. This will allow unfiltered
air to enter, causing rapid engine wear and
possible engine damage. Additionally, opera-
tion without the filter element will affect car-
buretor jetting with subsequent poor perfor-
mance and possible engine overheating.
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8-33
EBU01035Air 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
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EBU00296Carburetor 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.cCThe 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
EBU00301Idle speed adjustmentNOTE:
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 to
increase engine speed, and out to
decrease engine speed.
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1. Throttle stop screw1. Vis de butée de papillon1. Tornillo tope del acelerador
Specified idle speed:
1,700 ~1,900 r/min
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8-39
EBU00303Valve clearance adjustment
The correct valve clearance changes with use,
resulting in improper fuel/air supply or engine
noise. To prevent this, the valve clearance must
be adjusted regularly. This adjustment however,
should be left to a professional Yamaha service
technician.EBU00304Cam chain adjustment
The cam chain becomes loose with use, result-
ing in improper valve timing and engine noise.
To prevent this, the cam chain tensioner must
be adjusted regularly. This adjustment should be
left to a Yamaha service technician.
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