2001 YAMAHA YFM400F ignition

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WARNING

l
Always turn off the engine when refuel-
ing.
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Do not refuel right after the engine has
been running and is still very hot.
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Do not spill gasoline on the engine or ex-
haust pipe/muffler when refueling. Never
refuel while smoking, or while in the vi-
cinity of sparks, open flames, or other
sources of ignition such as the pilot lights
of water heaters and clothes dryers. Gas-
oline can catch fire and you could be
burned.
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When transporting the machine in anoth-
er vehicle, be sure it is kept upright and
that the fuel cock is in the “OFF” position.
Otherwise, fuel may leak out of the carbu-
retor or fuel tank.
l
Gasoline is poisonous. If you should swal-
low some gasoline or inhale a lot of gaso-
line vapor, or get some gasoline in your
eyes, see your doctor immediately. If gas-
oline spills on your skin, wash with soap
and water. If gasoline spills on your cloth-
ing, change your clothes.

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EBU00053
Handlebar switches
EBU00735
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.
EBU00606
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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EBU00745
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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8-131
EBU00724Troubleshooting chart
Starting problems or poor engine performance1. Fuel
Check if there is fuel
in the fuel tank.There is fuel.Turn the fuel cock
lever to “OFF”.No fuel.Fuel cock is
clogged.
Clean the
fuel cock. Some fuel.Turn the fuel cock
lever to “RES”.Restart the engine.
No fuel.Supply fuel.
2. Compression
Use the electric
starter to see if
there is compression.There is compression.
Compression normal.
No compression.Ask a Yamaha dealer to
inspect.
3. Ignition
Remove the
spark plug and
check electrodes.WetWipe clean with dry cloth.
DryAttach spark plug cap and
ground to chassis.Use the
electric starter.Spark is good.Ignition system is
normal.
Spark is weak.
Adjust the spark plug gap
or replace the spark plug. No spark.
Ask a Yamaha dealer to
inspect. 4. Battery
Use the electric starter.Engine turns over
quickly.Battery is good.
Engine turns over
slowly.Check the connections.Check the
fuel flow.
Turn the fuel cock
lever to “ON”.
Remove the fuel hose
from the fuel cock.

Yuki_Data:Yuki_data:Yuki:Yuki_1:ATV:HM00B061_YFM400FWA-61:YFM600SPEC-
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10-5
Brake:
Front brake type Dual disc brake
operation Right hand operation
Rear brake type Single disk brake
operation Left hand and right foot operation
Suspension:
Front suspension Double wishbone
Rear suspension Swingarm (monocross)
Shock absorber:
Front shock absorber Coil spring / oil damper
Rear shock absorber Coil spring / oil damper
Wheel travel:
Front wheel travel 160 mm
Rear wheel travel 180 mm
Electrical:
Ignition system DC-C.D.I.
Generator system A.C. magneto
Battery type YTX20L-BS
Battery voltage, capacity 12 V, 18 AH
Headlight type: Krypton bulbModel YFM400FA / YFM400FWAN