engine YAMAHA YFM80R 2002 Owner's Manual

6-3
EBU00580Starting a cold enginewAlways 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
accident or collision.1. Set the parking brake.
2. Turn the fuel cock to “ON”.
3. Turn the main switch to “ON” and the
engine stop switch to “RUN”.
4. Shift the transmission into neutral.
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6-5
NOTE:
This model is equipped with an ignition circuit
cut-off system.
The engine can be started under the following
conditions.
a. When the transmission is in neutral. At this
time the neutral indicator light should come
on. If the light does not come on, ask a
Yamaha dealer to inspect it.
b. When the transmission is in gear and the
rear brake lever is applied. However, it is
recommended to shift into neutral before
starting the engine.5. Use the choke lever in reference to the fig-
ure:
Position 1: Cold engine start-
ambient temperature below 30°C.
Position 2: Warming up position.
Position 3: Cold engine start-
ambient temperature above 25°C
and warm engine start position.
CHOKEON
O
F
F
q
we q
e0°10°20°30°
°C
a
1. Fully open “ON”2. Half open (warming up position)
3. Closed “OFF”a. Choke lever1. Pleine course “ON”
2. Mi-course (position de chauffe)
3. Fermé “OFF”
a. Levier de choke
1. Abierto completamente “ON”
2. Semiabierto (posición de calentamiento)
3. Cerrado “OFF”a. Palanca del starter AMBIENT TEMP. / CHOKE LEVER POSITIONPOSITION DE LEVIER DE STARTER / TEMP. AMBIANTEPOSICION DEL MANDO DEL STARTER / TEMP. AMBIENTE
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6-7
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 seconds
before the next attempt. Each cranking should
be as short as possible to preserve battery ener-
gy. Do not crank the engine more than 10 sec-
onds on each attempt.7. If the engine is started with the starter
(choke) in position 1, the choke lever
should be returned to position 2to 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.
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6-9
8. Continue warming up the engine until it
idles smoothly and return the choke lever
to position 3before riding.cCSee the “Engine break-in” section prior to
operating engine for the first time.
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6-11
EBU00181Starting a warm engine
To start a warm engine, refer to the “Starting a
cold engine” section. The choke lever should not
be used. The throttle should be opened slightly.EBU00184Warming 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 choke lever turned off.
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6-13
EBU00200Shifting
This model has a 3-speed forward transmission
with centrifugal automatic clutch. The transmis-
sion allows you to control the amount of power
you have available at a given speed or for start-
ing accelerating, climbing, etc. To shift into neu-
tral, return the throttle lever to its original posi-
tion and repeatedly depress the shift pedal until
it stops.cCDo not coast for long periods with the engine
off, and do not tow the machine a long dis-
tance. Even with gears in neutral, the trans-
mission is only properly lubricated when the
engine is running. Inadequate lubrication
may damage the transmission.
q
3
2
1N
1. Shift pedal N. Neutral1. Pédale de sélection N. Point mort1. Pedal del cambio N. Punto muerto
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6-15
EBU00650To start out and accelerate:
1. Release the throttle lever.cCAlways close the throttle while shifting
gears. Otherwise, damage to the engine and
drive train may result.2. Shift into first gear and release the shift
pedal.
3. Open the throttle gradually.
4. Once the machine has attained adequate
speed, release the throttle lever.
5. Shift into second gear and release the shift
pedal.
6. Open the throttle gradually.
7. Follow the same procedure when shifting
to the next higher gear.
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6-19
EBU00208To decelerate:
When slowing down or stopping, release the
throttle and apply the brakes smoothly and
evenly. As you slow down, shift to a lower gear.
Be sure that the engine has sufficiently slowed
before engaging a lower gear. Improper use of
the brakes or shifting can cause the tires to lose
traction, reducing control and increasing the
possibility of an accident.wMake sure the engine has sufficiently slowed
before shifting to a lower gear. Engaging a
lower gear when the engine speed is too
high could make the wheels stop rotating.
This could cause loss of control, an accident
and injury. It could also cause engine or
drive train damage.
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6-21
EBU00209Engine 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. During
the first 20 hours, the various parts in the engine
wear and polish themselves to the correct oper-
ating clearances.
During this period, prolonged full throttle opera-
tion or any condition which might result in exces-
sive engine heating must be avoided. However,
momentary (2 ~ 3 seconds maximum) full throt-
tle operation under load does not harm the
engine.
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6-23
Each full throttle acceleration sequence should
be followed with a substantial rest period for the
engine by cruising at lower r/min so the engine
can rid itself of the temporary build up of heat.
If any abnormality is noticed during this period,
consult a Yamaha dealer.
1. 0 ~ 10 hours:
Avoid continuous operation above half
throttle. Allow a cooling off period of five to
ten minutes after every hour of operation.
Vary the speed of the machine from time to
time. Do not operate it at one set throttle
position.
2. 10 ~ 20 hours:
Avoid prolonged operation above 3/4 throt-
tle. Rev the machine freely through the
gears but do not use full throttle at any
time.
3. After break-in:
Avoid prolonged full throttle operation.
Vary speeds occasionally.
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