engine YAMAHA YFM400F 2001 Manuale de Empleo (in Spanish)

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Handlebar switches
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Light switch
Turn the switch to the “ ” position to switch
on the low beam and the taillight.
Turn the switch to the “ ” position to switch
on the high beam and the taillight.
Turn the switch to the “OFF” position to switch
off the headlight and the taillight.
CAUTION:

Do not use the headlight 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.
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Engine stop switch
Make sure that the engine stop switch is in the
“ ” position. The engine stop switch con-
trols ignition and can be used at all times to
stop the engine, especially in an emergency.
The engine will not start or run when the en-
gine stop switch is turned to “ ”.
1. Lights switch
2. Engine stop switch
3. Start switch “ ”
4. Horn switch “ ”
1. Contacteur d’éclairage
2. Coupe-circuit du moteur
3. Contacteur du démarreur “ ”
4. Contacteur de l’avertisseur “ ”
1. Interruptor de luces
2. Interruptor de paro del motor
3. Interruptor de arranque “ ”
4. Interruptor de la bocina “ ”

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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.)
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Horn switch “ ”
Press the switch to sound the horn.
1. Lights switch
2. Engine stop switch
3. Start switch “ ”
4. Horn switch “ ”
1. Contacteur d’éclairage
2. Coupe-circuit du moteur
3. Contacteur du démarreur “ ”
4. Contacteur de l’avertisseur “ ”
1. Interruptor de luces
2. Interruptor de paro del motor
3. Interruptor de arranque “ ”
4. Interruptor de la bocina “ ”

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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 engine will return to an idle any time
the hand is removed 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 op-
eration 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.
1. Throttle lever
1. Levier d’accélération
1. Palanca de aceleración

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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. Screwing in the ad-
juster limits the maximum engine power avail-
able and decreases 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 speed adjuster out more than 12 mm
or the throttle cable could be damaged. Al-
ways make sure the throttle lever free play is
adjusted to 3 ~ 5 mm. See page 8-87.
1. Locknut 2. Adjusting bolt
1. Contre-écrou 2. Boulon de réglage
1. Contratuerca 2. Perno de ajuste

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Drive select lever
The drive select lever is used to shift your ma-
chine into the low, high, neutral, reverse and
park positions. (Refer to pages 6-11 ~ 6-15 for
the drive select lever operation.)
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Recoil starter
Firmly grasp the handle and pull slightly until
engagement can be felt. Then pull forcefully,
being careful not to pull the rope all the way
out.
WARNING
Shift the transmission in neutral or set the
shift lever to the park position before starting
the engine or the ATV could start to move un-expectedly, which could cause an accident.
1. Drive select lever
1. Levier de présélection
1. Palanca de selección de marcha1. Recoil starter
1. Lanceur à réenroulement
1. Arranque por tracción de cable

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Fuel cock
The fuel cock supplies fuel from the fuel tank to
the carburetor.
The fuel cock has three positions.
OFF: With the lever in this position fuel will
not flow. Always turn the lever to this
position when the engine is not running.
ON: With the lever in this position, fuel flows
to the carburetor. Normal riding is done
with the lever in this position.
1. Arrow mark
1. Flèche
1. Marcha de flechaON position
Robinet ouvert
Posición ON1. Arrow mark
1. Flèche
1. Marcha de flechaOFF position
Robinet fermé
Posición OFF

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RES: This indicates reserve. If you run out of
fuel while riding, turn the lever to this
position. THEN FILL THE FUEL TANK AT
THE FIRST OPPORTUNITY. After refuel-
ling, return the fuel cock lever to the
“ON” position.
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Starter (choke) “ ”
Starting a cold engine requires a richer air-fuel
mixture. A separate starter circuit supplies this
mixture.
Move in direction a to turn on the starter
(choke).
Move in direction b to turn off the starter
(choke).
Refer to “Starting a cold engine” for proper op-
eration. (See pages 6-3 ~ 6-7.)
1. Arrow mark
1. Flèche
1. Marcha de flechaRES position
Réserve
Posición RES1. Starter (choke) “ ”
1. Starter (enrichisseur) “ ”
1. Starter (choke) “ ”

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Auxiliary DC jack
The auxiliary DC jack is located at the front
right side of the ATV. The auxiliary DC jack can
be used for suitable work lights, radios, etc.
The auxiliary DC jack can only be used when
the main switch is in the “ON” position.
1. Turn the headlight switch to the “OFF”
position.
2. Start the engine. (See pages 6-3 ~ 6-9.)
3. Open the auxiliary DC jack cap and insert
the accessory power plug into the jack.
4. When the auxiliary DC jack is not being
used, cover it with the cap. Maximum rated capacity for the auxiliary
DC jack:
DC 12 V, 120 W (10 A)
1. Auxiliary DC jack cap
1. Capuchon du connecteur
1. Tapa de la toma de CC auxiliar1. Auxiliary DC jack
1. Connecteur pour accessoires
1. Toma de CC auxiliar

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CAUTION:l
Do not use accessories requiring more
than the above maximum capacity. This
may overload the circuit and cause the
fuse to blow.
l
If accessories are used without the engine
running or with the headlight turned on,
the battery will lose its charge and engine
starting may become difficult.
l
Do not use an automotive cigarette light-
er or other accessories with a plug that
gets hot because the jack can be dam-aged.

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PRE-OPERATION CHECKS
Before using this machine, check the following points:
ITEM ROUTINE PAGE
Brakes
• Check operation, free play, fluid level and fluid leakage.
• Fill with DOT 4 brake fluid if necessary.5-7 ~ 5-9,
8-91 ~ 8-95
Fuel
• Check fuel level.
• Fill with fuel if necessary.5-11 ~ 5-13
Engine oil
• Check oil level.
• Fill with oil if necessary.5-15 ~ 5-17,
8-31 ~ 8-41
Coolant reservoir
• Check coolant level.
• Fill with coolant if necessary.8-53 ~ 8-63
Final gear oil/
Differential gear oil
• Check for leakage. 5-19, 8-41 ~ 8-51
Throttle
• Check for proper throttle cable operation. 5-21, 8-87
Wheels and tires
• Check tire pressure, wear and damage.5-25 ~ 5-31,
8-107 ~ 8-109
Fittings and Fasteners
• Check all fittings and fasteners. 5-21
Lights
• Check for proper operation. 5-23, 8-121 ~ 8-127
Front axle boots
• Check for damage. 8-63