engine YAMAHA YFM400F 2001 Owner's Manual

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1. Fuel level 2. Filler tube
1. Niveau de carburant 2. Tube de remplissage
1. Nivel de combustible 2. Tubo del relleno
WARNING

l
Do not overfill the fuel tank. Fuel expands
when it heats up. If the fuel tank is over-
filled, fuel could spill out due to heat from
the engine or the sun.
l
Be careful not to spill fuel, especially on
the engine or exhaust pipe which can
cause a fire and severe injury. Wipe up
any spilled fuel immediately.
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Do not refuel right after the engine has
been running and is still very hot.
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Be sure the fuel tank cap is closed secure-
ly.

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EBU00485
Engine oil
Make sure the engine oil is at the specified lev-
el. Fill with oil as necessary. (See pages 8-31 ~
8-41 for details.)
-20°
-10°0°10°20°30°40°
50°C
5W/30
10W/30
10W/40
20W/50
15W/4020W/40
Recommended oil:
Recommended engine oil classification:
API Service SE, SF, SG type or higher

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CAUTION:

Be sure to use motor oils that do not contain
anti-friction modifiers. Passenger car motor
oils (often labeled “Energy Conserving”) con-
tain anti-friction additives which will cause
clutch and/or starter clutch slippage, resulting
in reduced component life and poor engine
performance.
Oil quantity:
Total amount:
2.6 L
Periodic oil change:
2.3 L
With oil filter replacement:
2.4 L

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Lights
Check the headlight and taillight to make sure
they are in working condition. Repair as neces-
sary for proper operation.
EBU00155
Switches
Check the operation of the headlight switch,
engine stop switch and any other switches. Re-
pair as necessary for proper operation.

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EBU00673
Starting a cold engine
WARNING

Always make sure all control cables work
smoothly before you begin riding in cold
weather. If the control cables are frozen or do
not work smoothly, you could be unable to
control the ATV, which could lead to an acci-
dent or collision.
1. Apply the rear brake lever.
2. Turn the fuel cock to “ON”.
3. Turn the main switch to “ON” and the en-
gine stop switch to “ ”.
4. Shift the drive select lever into the neutral
or park position.

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a. Starter (choke) lever
1. Fully open
2. Half open
3. Closed
a. Starter (enrichisseur)
1. Complètement ouvert
2. Mi-ouvert
3. Fermé
a. Starter (choke)
1. Abre completamente
2. Semiabierto
3. Cerrado
NOTE:

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When the drive select lever is in the neu-
tral or park position, if either indicator
light does not come on, ask a Yamaha
dealer to inspect its electric circuit.
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The engine can be started in any gear if
the rear brake lever is applied. However, it
is recommended to shift into neutral or
park before starting the engine.
5. Use the starter (choke) in reference to the
figure:
Position
1
: Cold engine start- ambient tem-
perature below 5 ˚C.
Position
2
: Cold engine start- ambient tem-
perature at 0 ˚C ~ 30 ˚C and
warming up position.
Position
3
: Cold engine start- ambient tem-
perature above 25 ˚C and warm
engine start position.
6. Completely close the throttle lever and
start the engine by pushing the start
switch.

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a. Starter (choke) lever
1. Fully open
2. Half open
3. Closed
a. Starter (enrichisseur)
1. Complètement ouvert
2. Mi-ouvert
3. Fermé
a. Palanca de starter (choke)
1. Abre completamente
2. Semiabierto
3. Cerrado
NOTE:

l
If the engine fails to start, release the start
switch, then push the start switch again.
Pause a few seconds before the next at-
tempt. Each cranking should be as short
as possible to preserve battery energy. Do
not crank the engine more than 10 sec-
onds on each attempt.
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If the battery is discharged, pull the recoil
starter to start the engine.
7. If the engine is started with the starter
(choke) in position
1
, the starter (choke)
should be returned to position
2
to warm
up the engine. If the engine is started with
the starter (choke) in position
2
, keep the
starter (choke) in this position to warm up
the engine.
8. Continue warming up the engine until it
idles smoothly and return the starter
(choke) to position
3
before riding.
CAUTION:

See the “Engine break-in” section prior to op-
erating the engine for the first time.

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Starting a warm engine
To start a warm engine, refer to the “Starting a
cold engine” section. The starter (choke)
should not be used. The throttle should be
opened slightly.
EBU00182
Warming up
To get maximum engine life, always warm up
the engine before starting off. Never accelerate
hard with a cold engine! To see whether or not
the engine is warm, check if it responds to the
throttle normally with the starter (choke)
turned off.

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1. Drive select lever
a. L (Low)
b. H (High)
c. N (Neutral)
d. R (Reverse)
e. P (Park)
1. Levier de présélection
a. L (Rapport inférieur)
b. H (Rapport supérieur)
c. N (Point mort)
d. R (Marche arrière)
e. P (Stationnement)
1. Palanca de selección de marcha
a. L (Baja)
b. H (Alta)
c. N (Punto muerto)
d. R (Marcha atrás)
e. P (Estacionamiento)
2. Shifting: Neutral to Reverse and Reverse
to Park
NOTE:

The drive select lever cannot be shifted into or
from reverse or park without applying the rear
brake.
a. Bring the machine to a complete stop and
return the throttle lever to the closed posi-
tion.
b. Apply the rear brake pedal.
c. Shift from neutral to reverse or from re-
verse to park and vice versa by moving
the drive select lever along the shift guide.
NOTE:

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When in reverse, the reverse indicator
light should be on. If the light does not
come on, ask a Yamaha dealer to inspect
the reverse indicator light electrical circuit.
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Due to the synchronizing mechanism in
the engine, the light may not come on un-
til the ATV starts moving.

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Engine break-in
There is never a more important period in the
life of your machine than the period between
zero and 20 hours.
For this reason, we ask that you carefully read
the following material. Because the engine is
brand new, you must not put an excessive load
on it for the first several hours of running. Dur-
ing the first 20 hours, the various parts in the
engine wear and polish themselves to the cor-
rect operating clearances.
During this period, prolonged full throttle oper-
ation or any condition which might result in ex-
cessive engine heating must be avoided.
However, momentary (2 ~ 3 seconds maxi-
mum) full throttle operation under load does
not harm the engine.
Each full throttle acceleration sequence should
be followed with a substantial rest period for
the engine by cruising at lower r/min so the en-
gine can rid itself of the temporary build up of
heat. If any abnormality is noticed during this
period, consult a Yamaha dealer.