2001 YAMAHA YFM660R engine

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WARNING
Wait for the engine and radiator to cool before
removing the radiator cap. You could be
burned by hot fluid and steam blown out un-
der pressure. Always put a thick rag over the
cap when opening. Allow any remaining pres-
sure to escape before completely removing
the cap.
EBU00498
Chain
Check the general condition of the chain and
check the chain slack before every ride. Lubri-
cate and adjust the chain as necessary. (See
pages 8-77 ~ 8-83 for details.)

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Throttle lever
Check to see that the throttle lever operates
correctly. It must open smoothly and spring
back to idle position when released. Repair as
necessary for proper operation.
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Fittings and Fasteners
Always check the tightness of chassis fittings
and fasteners before a ride. Take the machine
to a Yamaha dealer or refer to the Service Man-
ual for correct tightening torque.
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Lights
Check the headlight and tail/brake light to
make sure they are in working condition. Re-
pair as necessary for proper operation.
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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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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. Set the parking brake.
2. Turn the fuel cock to “ON”.
3. Turn the main switch to “ON” and the en-
gine stop switch to “ ”.
4. Shift the transmission into neutral.

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1. Fully open 2. Half open
3. Closed
1. Complètement ouvert 2. Mi-ouvert
3. Fermé
1. Abre completamente 2. Semiabierto
3. Cerrado
NOTE:
This model is equipped with an ignition circuit
cut-off system. The engine can be started un-
der the following conditions.


When the transmission is in neutral. The
neutral indicator light should come on. If
the light does not come on, ask a Yamaha
dealer to inspect it.


When the clutch is disengaged with the
transmission in any position. However, it
is recommended to shift into neutral be-
fore starting the engine.
5. Use the starter (choke) in reference to the
figure:
Position
1: Cold engine start-
ambient temperature below 5 ˚C.
Position
2: Cold engine start-
ambient temperature at 0 ˚C ~
30˚C and warming up position.
Position
3: Cold engine start-
ambient temperature above
25˚C and warm engine start po-
sition.

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6. Completely close the throttle lever and
start the engine by pushing the start
switch.
NOTE:
If the engine fails to start, release the start
switch, then push it again. Pause a few sec-
onds before the next attempt. Each cranking
should be as short as possible to preserve bat-
tery energy. Do not crank the engine more than
10 seconds on each attempt.
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 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.
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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.
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 le-
ver. Otherwise, the engine will misfire, pre-
venting normal operation.

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1. Shift pedal N. Neutral
R. Reverse
1. Pédale de sélection N. Point mort
R. Marche arrière
1. Pedal del cambio N. Punto muerto
R. Marcha atrás
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Shifting
This model has a 5-speed forward and 1-speed
reverse transmission. The transmission allows
you to control the amount of power you have
available at a given speed or for starting, accel-
erating, climbing hills, etc. To shift into neutral,
return the throttle lever to its original position,
apply the clutch and repeatedly depress the
shift pedal until it stops. When it stops, it will
be in first gear. Raise the pedal slightly to neu-
tral.
CAUTION:
1. Do not coast for long periods with the en-
gine off, and do not tow the machine a
long distance. Even in neutral position,
the transmission is only properly lubricat-
ed when the engine is running. Inade-
quate lubrication may cause damage.
2. Always use the clutch when changing
gears. The engine, transmission and driv-
etrain are not designed to withstand the
shock of forced shifting and can be dam-
aged by shifting without the clutch.

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To start out and accelerate:
1. Release the throttle lever.
CAUTION:
Always close the throttle while shifting gears.
Otherwise, damage to the engine and drive
train may result.
2. Pull the clutch lever to disengage the
clutch.
3. Shift into first gear.
4. Open the throttle gradually and at the
same time, release the clutch lever slowly.
5. Once the machine has attained adequate
speed, release the throttle, and at the
same time, quickly pull in the clutch lever.