2003 YAMAHA YFM660R engine

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 “”
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Handlebar switches
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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. _
U5LP62.book Page 11 Wednesday, May 8, 2002 11:24 AM

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 “”
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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 “”.
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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.)
U5LP62.book Page 13 Wednesday, May 8, 2002 11:24 AM

4-15 1. Throttle lever
1. Levier d’accélération
1. Palanca de aceleración
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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.
U5LP62.book Page 15 Wednesday, May 8, 2002 11:24 AM

4-17 1. Locknut 2. Adjusting screw a. 12 mm
1. Contre-écrou 2. Vis de réglage
1. Contratuerca 2. Tornillo de ajuste
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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 8-57. _
U5LP62.book Page 17 Wednesday, May 8, 2002 11:24 AM

4-19 1. Clutch lever
1. Levier d’embrayage
1. Palanca de embrague
1. Brake lever
1. Levier de frein
1. Palanca del freno
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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.)
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Brake lever
The brake lever is located on the right handlebar.
Pull it toward the handlebar to apply the front
brake.
U5LP62.book Page 19 Wednesday, May 8, 2002 11:24 AM

4-23 1. Button 2. Lock plate
1. Bouton 2. Verrou
1. Botón 2. Placa de bloqueo
1. Locked position
1. Position verrou bloqué
1. Posición bloqueada
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Parking brake
Use the parking brake when you have to start the
engine or park the machine, especially on a slope.
Squeeze the clutch lever while pushing the button,
then push in the lock plate to apply the parking
brake. Squeeze the clutch lever to release the
parking brake.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.
U5LP62.book Page 23 Wednesday, May 8, 2002 11:24 AM

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.
U5LP62.book Page 25 Wednesday, May 8, 2002 11:24 AM

4-27 1. Shift pedal
1. Pédale de sélection
1. Pedal de cambios
1. Reverse knob “REV”
1. Bouton de marche arrière “REV”
1. Botón de marcha atrás “REV”
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Shift pedal
This machine is equipped with a constant-mesh
5-speed forward and 1-speed reverse transmis-
sion. The shift pedal is located on the left side of
the engine and is used in combination with the
clutch when shifting.
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Reverse knob “REV”
The reverse knob is used to shift into reverse gear.
Refer to the “Reverse knob operation and reverse
driving” section (page 6-11) before operating this
machine in reverse gear.
U5LP62.book Page 27 Wednesday, May 8, 2002 11:24 AM