warning YAMAHA YFM660R 2002 Workshop Manual

7-67
RIDING OVER ROUGH TERRAIN
Riding over rough terrain should be done with cau-
tion. Look out for obstacles which could cause
damage to the ATV or could lead to an upset or ac-
cident. Be sure to keep your feet firmly mounted
on the footboards at all times. Avoid jumping the
ATV as loss of control and damage to the ATV
may result.
WARNING
_ Before operating in a new area, check for ob-
stacles. Never attempt to ride over large obsta-
cles, such as large rocks or fallen trees. When
you go over obstacles, always follow proper
procedures as described in the Owner’s Manu-
al. _
U5LP61.book Page 67 Monday, August 27, 2001 3:49 PM

7-71
With practice, over a period of time, skill at con-
trolled sliding can be developed. The terrain
should be chosen carefully before attempting such
maneuvers, since both stability and control are re-
duced. Bear in mind that sliding maneuvers should
always be avoided on extremely slippery surfaces
such as ice, since all control may be lost.
WARNING
_ Learn to safely control skidding or sliding by
practicing at low speeds and on level, smooth
terrain.
On extremely slippery surfaces, such as ice,
go slowly and be very cautious in order to re-
duce the chance of skidding or sliding out of
control. _
U5LP61.book Page 71 Monday, August 27, 2001 3:49 PM

8-1
EBU00516
PERIODIC MAINTENANCE AND
ADJUSTMENTPeriodic inspection, adjustment and lubrication will
keep your machine in the safest and most efficient
condition possible. Safety is an obligation of the
machine owner. The most important points of ma-
chine inspection, adjustment and lubrication are
explained on the following pages.
WARNING
Never service an engine while it is running.
Moving parts can catch clothing or parts of the
body, causing injury. Electrical components
can cause shocks or can start fires. Turn off
the engine when performing maintenance un-
less otherwise specified. Have a Yamaha deal-
er perform service if you are not familiar with
machine service.
U5LP61.book Page 1 Monday, August 27, 2001 3:49 PM

8-5
WARNING
Never modify this ATV through improper in-
stallation or use of accessories. Improper in-
stallation of accessories or modification of this
vehicle may cause changes in handling which
in some situations could lead to an accident.
All parts and accessories added to this vehicle
should be genuine Yamaha or equivalent com-
ponents designed for use on this ATV and
should be installed and used according to in-
structions. If you have questions, consult an
authorized Yamaha ATV dealer.
U5LP61.book Page 5 Monday, August 27, 2001 3:49 PM

8-33 1. Coolant drain bolt
1. Boulon de vidange du liquide de refroidissement
1. Perno de drenaje de refrigerante
1. Radiator cap
1. Bouchon de radiateur
1. Tapa del radiador
EBU01024
Changing the coolant
WARNING
_ Wait for the engine and radiator to cool before
removing the radiator cap. You could be
burned by hot fluid and steam blown out under
pressure. Always put a thick rag over the cap
when opening. Allow any remaining pressure
to escape before completely removing the cap. _1. Place the ATV on a level surface.
2. Remove panel A. (See page 8-15 for panel
removal and installation procedures.)
3. Place a container under the engine, and then
remove the coolant drain bolt.
4. Remove the radiator cap.
U5LP61.book Page 33 Monday, August 27, 2001 3:49 PM

8-45 1. Check hose
1. Flexible de contrôle
1. Manguito de comprobación
1. Air filter case cover 2. Holder (× 6)
1. Couvercle du boîtier de filtre à air 2. Support (× 6)
1. Tapa de la caja del filtro 2. Soporte (× 6)
EBU00818
Air filter element cleaningNOTE:There is a check hose at the bottom of the air filter
case. If dust or water collects in this hose, empty
the hose and clean the air filter element and air fil-
ter case.1. Remove the seat. (See page 4-33 for seat re-
moval procedure.)
2. Remove the air filter case cover by unhook-
ing the holders.
3. Remove the air filter element and remove it
from its frame.
4. Wash the element gently but thoroughly in
solvent.
WARNING
Always use parts cleaning solvent to clean the
air filter element. Never use low flash point sol-
vents or gasoline to clean the air filter element
because the engine could catch fire or ex-
plode.
U5LP61.book Page 45 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

8-67 a. Free play
a. Jeu
a. Juego libre
EBU00681
Front brake adjustment
The front brake lever should have a free play of
zero mm at the lever end. If not, ask a Yamaha
dealer to adjust it.
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 67 Monday, August 27, 2001 3:49 PM

8-69 a. Brake pedal position
a. Position de la pédale de frein
a. Posición del pedal del freno
EBU00952
Rear brake adjustment
Pedal height adjustmentThe top of the brake pedal should be positioned
4 mm below the top of the footboard. If not, ask a
Yamaha dealer to adjust it.
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 brake pedal position is cor-
rect.


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 69 Monday, August 27, 2001 3:49 PM

8-73
5. Screw in the adjusting bolt on the brake cali-
per by hand until it feels tight, then screw it
out 1/8 turn. Tighten the adjusting bolt locknut
to the specified torque.CAUTION:_ When tightening the locknut, hold the adjust-
ing bolt with a wrench so that the adjusting
bolt does not turn together with the locknut. _
WARNING
_ Operating with improperly adjusted brakes
could cause the brakes to malfunction, result-
ing in reduced braking performance. This
could increase the chance of a collision or ac-
cident. After adjusting the parking brake, block
the rear of the machine off the ground and spin
the rear wheels. Check to make sure there is
no brake drag. If brake drag is noticed, perform
the adjustment again. _
Tightening torque:
Locknut:
16 Nm (1.6 m·kgf)
U5LP61.book Page 73 Monday, August 27, 2001 3:49 PM