2002 YAMAHA YFM660R brake

4-25
WARNING


Always set the parking brake before start-
ing the engine. The ATV could start mov-
ing unexpectedly if the parking brake is not
applied. This could cause loss of control or
a collision.


Always be sure you have released the
parking brake before you begin to ride. The
brake could overheat if you ride the ATV
without releasing the parking brake. You
could lose braking performance which
could cause an accident. You could also
wear out the brakes prematurely.
U5LP61.book Page 25 Monday, August 27, 2001 3:49 PM

5-1
EBU00113
PRE-OPERATION CHECKS
Before using this machine, check the following points:
ITEM ROUTINE PAGE
Front brakeCheck operation, free play, fluid level and fluid leakage.
Fill with DOT 4 brake fluid if necessary.5-5 ~ 5-7,
8-59 ~ 8-67
Rear brakeCheck operation, fluid level and fluid leakage.
Fill with DOT 4 brake fluid if necessary.5-5 ~ 5-7,
8-59 ~ 8-65, 8-69
ClutchCheck operation, condition and lever free play. 8-77
Parking brakeCheck operation, condition and cable free play. 8-71 ~ 8-73
FuelCheck fuel level.
Fill with fuel if necessary.5-9 ~ 5-11
Engine oilCheck oil level.
Fill with oil if necessary.5-13 ~ 5-15,
8-17 ~ 8-29
Coolant reservoirCheck coolant level.
Fill with coolant if necessary.5-17 ~ 5-19,
8-31 ~ 8-39
Drive chainCheck chain slack and condition.
Adjust if necessary.5-19, 8-77 ~ 8-83
ThrottleCheck for proper throttle cable operation and free play. 5-21, 8-55
Wheels and tiresCheck tire pressure, wear and damage.5-23 ~ 5-29,
8-95 ~ 8-97
Fittings and fastenersCheck all fittings and fasteners. 5-21
LightsCheck for proper operation. 5-21, 8-107 ~ 8-117
U5LP61.book Page 1 Monday, August 27, 2001 3:49 PM

5-5
EBU00990
Front and rear brakes
Brake lever and brake pedal

Check that there is no free play in the brake le-
ver. If there is free play, have a Yamaha dealer
adjust it. Check for correct brake pedal height.
If the pedal height is incorrect, have a Yamaha
dealer adjust it. (See pages 8-67 ~ 8-69.)


Check the operation of the lever and pedal.
They should move smoothly and there should
be a firm feeling when the brakes are applied. If
not, have the machine inspected by a Yamaha
dealer.
Brake fluid level


Check the brake fluid level. Add fluid if neces-
sary. (See page 8-61.)
Recommended brake fluid: DOT 4
U5LP61.book Page 5 Monday, August 27, 2001 3:49 PM

5-7
Brake fluid leakage

Check to see if any brake fluid is leaking out of
the pipe joints or master cylinders. Apply the
brakes firmly for one minute. If there is any
leakage, have the machine inspected by a
Yamaha dealer.
Brake operation


Test the brakes at slow speed after starting out
to make sure they are working properly. If the
brakes do not provide proper braking perfor-
mance, inspect the brake pads for wear. (See
page 8-59.)WARNING
_ Always check the brakes at the start of every
ride. Do not ride the ATV if you find any prob-
lem with the brakes or you could lose braking
ability, which could lead to an accident. If a
problem cannot be corrected by the adjust-
ment procedures provided in this manual,
have the ATV inspected by a Yamaha dealer. _
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5-21
EBU00151
Throttle lever
Check to see that the throttle lever operates cor-
rectly. It must open smoothly and spring back to
idle position when released. Repair as necessary
for proper operation.
EBU00152
Fittings and Fasteners
Always check the tightness of chassis fittings and
fasteners before a ride. Take the machine to a
Yamaha dealer or refer to the Service Manual for
correct tightening torque.
EBU00991
Lights
Check the headlights and tail/brake light to make
sure they are in working condition. Repair as nec-
essary for proper operation.
EBU00912
Switches
Check the operation of the light switch, engine
stop switch and any other switches. Repair as nec-
essary for proper operation.
U5LP61.book Page 21 Monday, August 27, 2001 3:49 PM

6-3
EBU00815
Starting a cold engine
WARNING
Always make sure all control cables work
smoothly before you begin riding in cold
weather. If the control cables are frozen or do
not work smoothly, you could be unable to
control the ATV, which could lead to an acci-
dent or collision. 1. Set the parking brake.
2. Turn the fuel cock to “ON”.
3. Turn the main switch to “ON” and the engine
stop switch to “”.
4. Shift the transmission into neutral.
U5LP61.book Page 3 Monday, August 27, 2001 3:49 PM

6-9
EBU00180
Starting a warm engine
To start a warm engine, refer to the “Starting a cold
engine” section. The starter (choke) should not be
used. The throttle should be opened slightly.
EBU00538
Warming up
To get maximum engine life, always warm up the
engine before starting off. Never accelerate hard
with a cold engine! To see whether or not the en-
gine is warm, check if it responds to the throttle
normally with the starter (choke) turned off.NOTE:When the parking brake is used, engine speed is
limited to 2,300 r/min. Be sure the parking brake is
released before moving the throttle lever. Other-
wise, the engine will misfire, preventing normal op-
eration.
U5LP61.book Page 9 Monday, August 27, 2001 3:49 PM

6-11 1. Reverse knob “REV”
2. Shift pedal
1. Bouton de marche arrière “REV”
2. Pédale de sélection
1. Botón de marcha atrás “REV”
2. Pedal del cambio
EBU00816
Reverse knob operation and reverse drivingCAUTION:
Before shifting, stop the machine and return
the throttle lever to its closed position. Other-
wise the transmission may be damaged. 1. Bring the machine to a complete stop, return
the throttle lever to the closed position, apply
the clutch lever, and shift the transmission
into first gear.
2. While applying the rear brake pedal, turn the
reverse knob clockwise with your right hand.
3. Shift the transmission into reverse by press-
ing down on the shift pedal.NOTE:When in reverse, the reverse indicator light should
be on. If the light does not come on, ask a Yamaha
dealer to inspect the machine.
U5LP61.book Page 11 Monday, August 27, 2001 3:49 PM