light YAMAHA YFM400F 2001 Owner's Manual

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CROSSING A SLOPE
Traversing a sloping surface on your ATV re-
quires you to properly position your weight to
maintain proper balance. Be sure that you
have learned the basic riding skills on flat
ground before attempting to cross a sloping
surface. Avoid slopes with slippery surfaces or
rough terrain that may upset your balance.
As you travel across a slope, lean your body in
the uphill direction. It may be necessary to cor-
rect the steering when riding on loose surfaces
by pointing the front wheels slightly uphill.
When riding on slopes be sure not to make
sharp turns either up or down hill.

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7. Apply a light coat of engine oil to the
O-ring of the new oil filter.NOTE:Make sure the O-ring is seated properly.
8. Install the oil filter and tighten it to the
specified torque with an oil filter wrench.
Tightening torque:
Oil filter:
17 Nm (1.7 m·kg)
1. Torque wrench
1. Clé dynamométrique
1. Llave de apriete

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Spark plug inspection
Removal
1. Remove the spark plug cap.
2. Use the spark plug wrench in the tool kit
to remove the spark plug as shown.
Inspection
The spark plug is an important engine compo-
nent and is easy to inspect. The condition of
the spark plug can indicate the condition of the
engine.
The ideal color on the white insulator around
the center electrode is a medium-to-light tan
color for a ATV that is being ridden normally.
1. Spark plug wrench
1. Clé à bougie
1. Llave de bujía1. Spark plug cap
1. Capuchon de bougie
1. Tapa de bujía

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Fuse replacement
1. The fuse cases are under the seat.
2. If a fuse is blown, turn off the main switch
and the switch of the circuit in question.
Then, install a new fuse of the specified
amperage. Turn on the main switch. If the
fuse immediately blows again, consult a
Yamaha dealer.
Specified fuses:
Main fuse: 30 A
Headlight fuse: 15 A
Ignition fuse: 10 A
Auxiliary DC jack fuse: 10 A
Four-wheel-drive fuse: 3 A
Signal fuse (horn): 10 A
1. Main fuse 2. Spare fuse
1. Fusible principal 2. Fusible de rechange
1. Fusible principal 2. Fusible de repuesto1. Fuse box
1. Boîte à fusibles
1. Caja de fusibles

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WARNING
Always use a fuse of the specified rating. Nev-
er use any type of material or object in place of
the proper fuse. An improper fuse can cause
damage to the electrical system which couldlead to a fire.CAUTION:To prevent accidental short-circuiting, turn off
the main switch when checking or replacing afuse.
1. Headlight fuse
2. Ignition fuse
3. Auxiliary DC jack fuse
4. Four-wheel-drive fuse
5. Signal fuse
6. Spare fuse (´ 3)
1. Fusible principal
2. Fusible d’allumage
3. Fusible de connecteur pour accessoires
4. Fusible du système 4x4
5. Fusible de signalisation
6. Fusible de rechange (´ 3)
1. Fusible del faro
2. Fusible del sistema de encendido
3. Fusible de la toma de CC auxiliar
4. Fusible del sistema de tracción en las cuatro ruedas
5. Fusible señalización
6. Fusible de repuesto (´ 3)

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Replacing the headlight bulb
If the headlight bulb burns out, replace it as fol-
lows:
1. Remove the cover at the rear of the head-
light.
2. Remove the bulb holder cover.
1. Cover
1. Cache
1. Cubierta1. Bulb holder cover
1. Cache du support d’ampoule
1. Cubierta del portabombillas

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3. Unhook the bulb holder spring and re-
move the defective bulb.
WARNING
The headlight bulb is hot when it is on and im-
mediately after it is turned off. Wait for the
bulb to cool down before touching or remov-
ing it. You can be burned, or a fire could start ifthe bulb touches something flammable.
4. Put a new bulb into position and secure it
in place with the bulb holder spring.
5. Install the bulb holder cover.
1. Bulb holder
1. Fixation d’ampoule
1. Portabombillas

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Headlight beam adjustmentCAUTION:It is advisable to have a Yamaha dealer makethis adjustment.
1. Vertical adjustment:
To raise the beam, turn the adjusting
screw clockwise.
To lower the beam, turn the screw coun-
terclockwise.
1. Headlight beam adjusting screw
1. Vis de réglage du faisceau de phare
1. Tornillo de ajuste de la luz del faro

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Taillight bulb replacement
1. Remove the screws and the lens.
2. Remove the defective bulb by pushing it
inward and turning it counterclockwise.
3. Install a new bulb by pushing it inward
and turning it clockwise.
4. Install the lens and tighten the screws.CAUTION:Do not over-tighten the screws as the lensmay break.
1. Screw (´ 2)
1. Vis (´ 2)
1. Tornillo (´ 2)1. Taillight bulb
1. Ampoule de feu arrière
1. Bombilla de la luz de cola

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Troubleshooting
Although Yamaha machines receive a rigid in-
spection before shipment from the factory,
trouble may occur during operation.
Any problem in the fuel, compression, or igni-
tion systems can cause poor starting and loss
of power. The troubleshooting chart describes
a quick, easy procedure for making checks. If
your machine requires any repair, take it to a
Yamaha dealer.
The skilled technicians at a Yamaha dealership
have the tools, experience, and know-how to
properly service your machine. Use only genu-
ine Yamaha parts on your machine. Imitation
parts may look like Yamaha parts, but they are
often inferior. Consequently, they have a short-
er service life and can lead to expensive repair
bills.
WARNING
Do not smoke when checking the fuel system.
Fuel can ignite or explode, causing severe inju-
ry or property damage. Make sure there are no
open flames or sparks in the area, including pi-lot lights from water heaters or furnaces.