YAMAHA YFZ450R 2009 Owners Manual

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EBU23090
Removing and installing panels
The panels shown need to be removed to perform
some of the maintenance jobs described in this
chapter. Refer to this section each time a panel
needs to be removed and installed.
EBU29531
Panel A
To remove the panel
1. Remove the seat. (See page 4-10.)
2. Remove the fuel tank cap. (See page 4-8.)
3. Remove the bolts.

1. Panel A
2. Panel B
3. Panel C
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1. Panel D
2. Panel E
3. Panel F
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4. Remove the quick fasteners, and then slide
the panel backward and pull upward.To install the panel
1. Place the panel in the original position, and
then install the quick fasteners.

1. Bolt
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1. Quick fastener
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NOTICE

ECB00380
When installing the panel, be sure not to pinch
the cables or wires.
2. Install the bolts.
3. Install the fuel tank cap.
Panels B and D
To remove one of the panels
1. Remove panel A.
2. Pull the panel off.To install one of the panels
1. Place the panel in its original position.
2. Install panel A.
1. Projection
2. Slot
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Panel C
To remove the panel
1. Remove panels A, B and D.
2. Remove the bolts, and then take the panel off.
To install the panel
Place the panel in its original position, and then in-
stall the bolts.
Panel E
To remove the panel1. Remove panel A.
2. Remove the bolts, and then take the panel off.
1. Bolt
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1. Bolt
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To install the panel
1. Place the panel in the original position and in-
stall the bolts.
2. Install panel A.
Panel F
To remove the panel1. Remove panel E.
2. Remove the bolts, and then take the panel off.
To install the panel1. Place the panel in the original position and in-
stall the bolts.
2. Install panel E.

1. Bolt
1. Bolt
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1. Bolt
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EBU29440
Checking the spark plug
The spark plug is an important engine component,
which should be checked periodically, preferably
by a Yamaha dealer. Since heat and deposits will
cause any spark plug to slowly erode, the spark
plug should be removed and checked in accor-
dance with the periodic maintenance and lubrica-
tion chart. In addition, the condition of the spark
plug can reveal the condition of the engine.
The porcelain insulator around the center elec-
trode of the spark plug should be a medium-to-light
tan (the ideal color when the vehicle is ridden nor-
mally). If the spark plug shows a distinctly different
color, the engine could be operating improperly.
Do not attempt to diagnose such problems your-
self. Instead, have a Yamaha dealer check the ve-
hicle.
If a spark plug shows signs of electrode erosion
and excessive carbon or other deposits, it should
be replaced.
Before installing a spark plug, the spark plug gap
should be measured with a wire thickness gaugeand, if necessary, adjusted to specification.
Clean the surface of the spark plug gasket and its
mating surface, and then wipe off any grime from
the spark plug threads.
Specified spark plug:
NGK/CR8E
1. Spark plug gap
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
Tightening torque:
Spark plug:
12.5 Nm (1.3 m·kgf, 9.4 ft·lbf)

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TIP

If a torque wrench is not available when installing
a spark plug, a good estimate of the correct torque
is 1/4–1/2 turn past finger tight. However, the spark
plug should be tightened to the specified torque as
soon as possible.
EBU29492
Engine oil and oil filter element
The engine oil level should be checked before
each ride. In addition, the oil must be changed and
the oil filter element replaced at the intervals spec-
ified in the periodic maintenance and lubrication
chart.
To check the engine oil level
1. Place the ATV on a level surface.
2. Start the engine, warm it up until the engine oil
has reached a normal temperature of 40 °C
(104 °F), let it continue to idle for ten seconds
or more, and then turn the engine off.
TIP

To achieve the proper engine oil temperature for
an accurate oil level reading, the engine must have
first completely cooled down, and then warmed up
again for several minutes to normal operating tem-
perature.
3. Remove the engine oil tank filler cap, and
wipe the dipstick off with a clean rag.
4. Insert the dipstick into the filler hole (without
screwing it in), and then remove it again to
check the oil level.TIP

The engine oil should be between the minimum
1. Engine oil tank filler cap
2. Dipstick
3. Maximum level mark
4. Minimum level mark
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and maximum level marks.
5. If the engine oil is at or below the minimum
level mark, add sufficient oil of the recom-
mended type through the engine oil tank filler
hole to raise it to the correct level.
TIP

When adding oil, be careful not to overfill the en-
gine oil tank; the oil level rises faster starting from
the half-level-portion on the dipstick.
6. Insert the dipstick into the engine oil tank filler
hole, and then tighten the engine oil tank filler
cap.
NOTICE

ECB00361
Make sure that the engine oil tank filler cap is
securely tightened; otherwise, oil may seep
out when the engine is running.
To change the engine oil (with or without oil
filter element replacement)
1. Place the ATV on a level surface.
2. Remove the engine guard by removing the
bolts.3. Start the engine, warm it up for several min-
utes, and then turn it off.
4. Place an oil pan under the engine to collect
the used oil.
5. Remove the crankcase engine oil drain bolt.
1. Engine guard
2. Bolt
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6. Remove the engine oil tank filler cap and the
engine oil tank drain bolt.7. Check the washers for damage, and replace if
necessary.
TIP

Skip steps 8–11 if the oil filter element is not being
replaced.
8. Remove the oil filter element cover by remov-
ing the bolts, and then remove the oil filter el-
ement.
1. Crankcase engine oil drain bolt
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1. Engine oil tank drain bolt
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9. Check the O-rings for damage, and replace
them if necessary.10. Install a new oil filter element and the O-rings.
TIP
Make sure that the O-rings are properly seated.
11. Install the oil filter element cover by installing
the bolts, and then tighten them to the speci-
fied torque.
1. Oil filter element cover
2. Bolt
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1. Oil filter element
2. O-ring
Tightening torque:
Oil filter element cover bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
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