2005 YAMAHA YFM660R engine

4-7
EBU00714
Coolant temperature warning light checking method
ACB-09E
Turn the main switch to “ON” and
the engine stop switch to “”.
Coolant temperature warning
light does not come on.
Coolant temperature
warning light comes on.
Coolant temperature
warning light does not
come on.
Coolant temperature and
electrical circuit are OK. Go
ahead with riding.
Push the start switch with the
transmission in the neutral position.
Ask a Yamaha dealer to
inspect the electrical circuit.
Coolant temperature
warning light comes on
momentarily.
U5LP64.book Page 7 Thursday, April 1, 2004 4:53 PM

4-11 1. Light switch “OFF/ /”
2. Engine stop switch “/”
3. Start switch “”
1. Contacteur d’éclairage “OFF/ /”
2. Coupe-circuit du moteur “/”
3. Contacteur du démarreur “”
1. Interruptor de las luces “OFF/ /”
2. Interruptor de paro del motor “/”
3. Interruptor de arranque “”
EBU00053
Handlebar switches
EBU01204
Light switch “OFF/ /”
Set the switch to “” to turn on the low beam and
the taillight.
Set the switch to “” to turn on the high beam
and the taillight.
Set the switch to “OFF” to turn off all the lights.CAUTION:_ Do not use the headlights with the engine
turned off for more than thirty minutes. The
battery may discharge to the point that the
starter motor will not operate properly. If this
should happen, remove the battery and re-
charge it. _
U5LP64.book Page 11 Thursday, April 1, 2004 4:53 PM

4-13 1. Light switch “OFF/ /”
2. Engine stop switch “/”
3. Start switch “”
1. Contacteur d’éclairage “OFF/ /”
2. Coupe-circuit du moteur “/”
3. Contacteur du démarreur “”
1. Interruptor de las luces “OFF/ /”
2. Interruptor de paro del motor “/”
3. Interruptor de arranque “”
EBU01205
Engine stop switch “/”
Make sure that the engine stop switch is set to
“” before starting the engine. The engine stop
switch controls ignition and can be used at all
times to stop the engine, especially in an emer-
gency. The engine will not start or run when the
engine stop switch is set to “”.
EBU00607
Start switch “”
The starter motor cranks the engine when this
switch is pushed.CAUTION:
See starting instructions prior to starting the
engine. (See page 6-3 for details.)
U5LP64.book Page 13 Thursday, April 1, 2004 4:53 PM

4-15 1. Throttle lever
1. Levier d’accélération
1. Palanca de aceleración
EBU00063
Throttle lever
Once the engine is running, movement of the
throttle lever will increase the engine speed.
Regulate the speed of the machine by varying the
throttle position. Because the throttle is spring-
loaded, the machine will decelerate, and the en-
gine will return to an idle any time the hand is re-
moved from the throttle lever.
Before starting the engine, check the throttle to be
sure it is operating smoothly. Make sure it returns
to the idle position as soon as the lever is released.
WARNING
Malfunction of the throttle could make it diffi-
cult to speed up or slow down when you need
to. This could cause an accident. Check the
operation of the throttle lever before you start
the engine. If the throttle does not work
smoothly, check for the cause. Correct the
problem before riding the ATV or consult a
Yamaha dealer.
U5LP64.book Page 15 Thursday, April 1, 2004 4:53 PM

4-17 1. Locknut 2. Adjusting screw a. 12 mm
1. Contre-écrou 2. Vis de réglage
1. Contratuerca 2. Tornillo de ajuste
EBU01198
Speed limiter
The speed limiter keeps the throttle from fully
opening, even when the throttle lever is pushed to
the maximum. Turning in the adjusting screw limits
the maximum engine power available and de-
creases the maximum speed of the ATV.
WARNING
_ Improper adjustment of the speed limiter and
throttle could cause throttle cable damage or
improper throttle operation. You could lose
control, have an accident or be injured. Do not
turn the adjusting screw out more than 12 mm
or the throttle cable could be damaged. Always
make sure the throttle lever free play is adjust-
ed to 3–5 mm. See page 8-63. _
U5LP64.book Page 17 Thursday, April 1, 2004 4:53 PM

4-19 1. Clutch lever
1. Levier d’embrayage
1. Palanca de embrague
1. Brake lever
1. Levier de frein
1. Palanca del freno
EBU00069
Clutch lever
The clutch lever is located on the left handlebar
and the ignition circuit cut-off system is incorporat-
ed in the clutch lever holder. Pull the clutch lever to
the handlebar to disengage the clutch, and release
the lever to engage the clutch. The lever should be
pulled rapidly and released slowly for smooth
clutch operation. (Refer to “Starting a cold engine”
for a description of the ignition circuit cut-off sys-
tem.)
EBU00988
Brake lever
The brake lever is located on the right handlebar.
Pull it toward the handlebar to apply the front
brake.
U5LP64.book Page 19 Thursday, April 1, 2004 4:53 PM

4-23 1. Parking brake lever (Locked position)
1. Levier de frein de stationnement (frein serré)
1. Palanca del freno de estacionamiento
(posición de bloqueo)
1. Parking brake lever (Unlocked position)
1. Levier de frein de stationnement (frein relâché)
1. Palanca del freno de estacionamiento
(posición de desbloqueo)
EBU14072
Parking brake lever
Use the parking brake when you have to start the
engine or park the machine, especially on a slope.
To apply the parking brake, move the parking
brake lever in direction
a. To release the parking
brake, move the parking brake lever in
direction
b.
U5LP64.book Page 23 Thursday, April 1, 2004 4:53 PM

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.
_
U5LP64.book Page 25 Thursday, April 1, 2004 4:53 PM