2005 YAMAHA YFZ450 maintenance

8-17 1. Panel A
1. Cache A
1. Panel A
1. Quick fastener screw 2. Bolt
1. Vis à serrage rapide 2. Boulon
1. Perno del fijador rápido 2. Perno
EBU08070
Panel removal and installation
The panel illustrated needs to be removed to per-
form 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 remove1. Remove the seat. (See page 4-27 for seat re-
moval 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.
U5TG61.book Page 17 Friday, April 2, 2004 11:28 AM

8-23
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 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, 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. _
U5TG61.book Page 23 Friday, April 2, 2004 11:28 AM

8-71
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 element 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 mani-
fold fittings for an airtight seal. Tighten all fittings
securely to avoid the possibility of unfiltered air en-
tering the engine. _CAUTION:_ 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, op-
eration without the air filter element will affect
carburetor jetting with subsequent poor per-
formance and possible engine overheating. _
U5TG61.book Page 71 Friday, April 2, 2004 11:28 AM

8-73
EBU02960
Carburetor adjustment
The carburetor is a vital part of the engine and re-
quires very sophisticated adjustment. Most adjust-
ing should be left to a Yamaha dealer who has the
professional knowledge and experience to do so.
However, the idling speed may be performed by
the owner as a part of the usual maintenance rou-
tine.CAUTION:_ The carburetor was set at the Yamaha factory
after many tests. If the settings are disturbed
by someone without sufficient technical
knowledge, poor engine performance and
damage may result. _
U5TG61.book Page 73 Friday, April 2, 2004 11:28 AM

8-87
EBU11860
Brake fluid replacement
Complete fluid replacement should be done only
by trained Yamaha service personnel. Have a
Yamaha dealer replace the following components
during periodic maintenance or when they are
damaged or leaking.

Replace the oil seals every two years.


Replace the brake hoses every four years.
U5TG61.book Page 87 Friday, April 2, 2004 11:28 AM

8-107 1. O-rings
1. Joints toriques
1. Juntas tóricas
EBU08050
Lubricating the drive chain
The drive chain must be cleaned and lubricated at
the intervals specified in the periodic maintenance
and lubrication chart, otherwise it will quickly wear
out, especially when riding in dusty or wet areas.
Service the drive chain as follows.CAUTION:_ The drive chain must be lubricated after wash-
ing the ATV or riding in the rain. _1. Clean the drive chain with kerosene and a
small soft brush.CAUTION:_ To prevent damaging the O-rings, do not clean
the drive chain with steam cleaners, high-pres-
sure washers or inappropriate solvents. _
U5TG61.book Page 107 Friday, April 2, 2004 11:28 AM

8-129 1. Negative battery lead 2. Positive battery lead
1. Câble négatif de batterie 2. Câble positif de batterie
1. Cable negativo de la batería 2. Cable positivo de la batería
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.CAUTION:_ A special battery charger (constant volt-
age/ampere or constant voltage) is required for
recharging a sealed-type battery. Using a con-
ventional battery charger may shorten the bat-
tery life. _2. Always make sure the connections are cor-
rect when putting the battery back in the ma-
chine.
U5TG61.book Page 129 Friday, April 2, 2004 11:28 AM