2002 YAMAHA YFM660R maintenance

8-15 1. Panel A
1. Cache A
1. Panel A
1. Panel A 2. Bolt (× 2)
1. Cache A 2. Boulon (× 2)
1. Panel A 2. Perno (× 2)
EBU00807
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.
EBU01013
Panel A
To removeRemove the bolts, and then take the panel off.
To installPlace the panel in the original position, and then
install the bolts.
U5LP61.book Page 15 Monday, August 27, 2001 3:49 PM

8-17 1. Engine oil tank
2. Engine oil tank filler cap
3. Maximum level mark
4. Minimum level mark
1. Réservoir d’huile de moteur
2. Bouchon de remplissage de l’huile de moteur
3. Repère de niveau maximum
4. Repère de niveau minimum
1. Depósito de aceite de motor
2. Tapa de relleno del depósito de aceite de motor
3. Marca de nivel máximo
4. Marca de nivel mínimo
EBU01014
Engine oil and oil filter cartridge
The engine oil level should be checked before
each ride. In addition, the oil must be changed and
the oil filter cartridge replaced at the intervals
specified in the periodic maintenance and lubrica-
tion 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
60°C, let it continue to idle for ten seconds,
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. _3. Wait a few minutes until the oil settles, re-
move the engine oil tank filler cap, wipe the
dipstick clean with a clean rag, insert it back
into the filler hole (without screwing it in), and
then remove it again to check the oil level.
U5LP61.book Page 17 Monday, August 27, 2001 3:49 PM

8-51
EBU00296
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.
U5LP61.book Page 51 Monday, August 27, 2001 3:49 PM

8-65
EBU00820
Brake fluid replacement
1. Complete fluid replacement should be done
only by trained Yamaha service personnel.
2. Have a Yamaha dealer replace the following
components during periodic maintenance or
when they are damaged or leaking.

Replace all rubber seals every two years.


Replace all hoses every four years.WARNING
_ Operating with improperly serviced or adjust-
ed brakes could cause loss of braking ability
which could lead to an accident.
After servicing:

Make sure the brakes operate smoothly
and that the free play is correct.


Make sure the brakes do not drag.


Make sure the brakes are not spongy. All
air must be bled from the brake system.
Replacement of brake components requires
professional knowledge. These procedures
should be performed by a Yamaha dealer.
U5LP61.book Page 65 Monday, August 27, 2001 3:49 PM

8-83 1. O-rings
1. Joints toriques
1. Juntas tóricas
EBU00805
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. Ser-
vice 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.
U5LP61.book Page 83 Monday, August 27, 2001 3:49 PM

8-103
EBU00385
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 voltage/
ampere or constant voltage) is required for re-
charging a sealed-type battery. Using a con-
ventional battery charger may shorten the
battery life. 2. Always make sure the connections are cor-
rect when putting the battery back in the ma-
chine.
U5LP61.book Page 103 Monday, August 27, 2001 3:49 PM