2006 YAMAHA YFZ450 maintenance

8-7
EBU02622
PERIODIC MAINTENANCE/LUBRICATION
NOTE:8For ATVs not equipped with an odometer or an hour meter, follow the month maintenance intervals.
8For ATVs equipped with an odometer or an hour meter, follow the km (mi) or hours maintenance intervals. However, keep in mind
that if the ATV isn’t used for a long period of time, the month maintenance intervals should be followed.
8Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and technical skills.
INITIAL EVERY
month 1 3 6 6 12
ITEM ROUTINEWhichever
km 320 1200 2400 2400 4800 comes first
(mi) (200) (750) (1500) (1500) (3000)
hours 20 75 150 150 300
Fuel line*9Check fuel hose for cracks or damage.
222
9Replace if necessary.
9Check condition.
Spark plug9Adjust gap and clean.22222
9Replace if necessary.
Valves*9Check valve clearance.
2 222
9Adjust if necessary.
Carburetor*9Check starter (choke) operation.
2222
9Adjust engine idle speed.
Crankcase breather9Check breather hose for cracks or damage.
222
system*9Replace if necessary.
9Check for leakage.
Exhaust system*9Tighten if necessary.222
9Replace gasket if necessary.
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8-19
EBU08070
Panel removal and installation
The panel illustrated needs to be removed to
perform some of the maintenance described in
this chapter.
Refer to this section each time the panel has to
be removed or installed.
EBU13921
Panel A
To remove
1. Remove the seat. (See page 4-27 for seat
removal and installation procedures.)
2. Remove the quick fastener screw and the
bolts, and then remove the panel by pulling
it out from the front of the ATV.
1. Panel A1. Panel A1. Panel A
1. Quick fastener screw 2. Bolt
1. Vis à serrage rapide2. Boulon1. Perno del fijador rápido 2. Perno
5TG-9-63 8 10/26/05 4:54 PM Page 8-19

8-25
EBU13932
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
specified in the periodic maintenance and lubri-
cation 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 tempera-
ture of 40 ° C, let it continue to idle for ten
seconds or more, and then turn the engine
off.
NOTE:
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 temperature.
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8-73
NOTE:
The air filter element should be cleaned every
20-40 hours. It should be cleaned and lubricated
more often if the machine is operated in
extremely dusty areas. Each time air filter ele-
ment maintenance is performed, check the air
inlet to the air filter case for obstructions. Check
the air intake duct between the air filter case and
the carburetor and the manifold fittings for an
airtight seal. Tighten all fittings securely to avoid
the possibility of unfiltered air entering the
engine.
cC
Never operate the engine with the air filter
element removed. This will allow unfiltered
air to enter the engine, causing rapid engine
wear and possible engine damage.
Additionally, operation without the air filter
element will affect carburetor jetting with
subsequent poor performance and possible
engine overheating.
5TG-9-63 8 10/26/05 4:54 PM Page 8-73

8-91
EBU11860
Brake fluid replacement
Complete fluid replacement should be done only
by trained Yamaha service personnel. Have a
Yamaha dealer replace the following compo-
nents during periodic maintenance or when they
are damaged or leaking.
8Replace the oil seals every two years.
8Replace the brake hoses every four years.
5TG-9-63 8 10/26/05 4:54 PM Page 8-91

8-133
EBU03850
Battery maintenance
1. When the machine is not used for a month
or longer, remove the battery and store it in
a cool, dark place. Completely recharge
the battery before reinstallation.
cC
A special battery charger (constant
voltage/ampere or constant voltage) is
required for recharging a sealed-type bat-
tery. Using a conventional battery charger
may shorten the battery life.
2. Always make sure the connections are cor-
rect when putting the battery back in the
machine.
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