2002 YAMAHA YFM660R coolant temperature

4-3 1. Reverse indicator light “R”
2. Neutral indicator light “N”
3. Coolant temperature warning light “”
1. Témoin de marche arrière “R”
2. Témoin de point mort “N”
3. Témoin d’avertissement de la température du liquide de
refroidissement “”
1. Luz de control de marcha atrás “R”
2. Luz de control de punto muerto “N”
3. Luz de aviso de la temperatura del
refrigerante “”
EBU00802
Indicator and warning lights
EBU00602
Reverse indicator light “R”
This indicator light comes on when the transmis-
sion is in reverse.
EBU00603
Neutral indicator light “N”
This indicator light comes on when the transmis-
sion is in neutral.
U5LP61.book Page 3 Monday, August 27, 2001 3:49 PM

4-5 1. Reverse indicator light “R”
2. Neutral indicator light “N”
3. Coolant temperature warning light “”
1. Témoin de marche arrière “R”
2. Témoin de point mort “N”
3. Témoin d’avertissement de la température du liquide de
refroidissement “”
1. Luz de control de marcha atrás “R”
2. Luz de control de punto muerto “N”
3. Luz de aviso de la temperatura del
refrigerante “”
EBU00713
Coolant temperature warning light “”
When the coolant temperature reaches a specified
level, this light comes on to warn that the coolant
temperature is too hot. If the light comes on during
operation, stop the engine as soon as it is safe to
do so and allow the engine to cool down for about
10 minutes.
The coolant temperature warning light circuit can
be checked according to the procedure on page
4-7.CAUTION:

The engine may overheat if the ATV is
overloaded. If this happens, reduce the
load to specification.


Restart after making sure that the light is
out. Continuous use while the light is on
may cause damage to the engine.
U5LP61.book Page 5 Monday, August 27, 2001 3:49 PM

4-7
EBU00714
Coolant temperature warning light checking method
ACB-09E
Turn the main switch to “ON” and
the engine stop switch to “”.
Coolant temperature warning
light does not come on.
Coolant temperature
warning light comes on.
Coolant temperature
warning light does not
come on.
Coolant temperature and
electrical circuit are OK. Go
ahead with riding.
Push the start switch with the
transmission in the neutral position.
Ask a Yamaha dealer to
inspect the electrical circuit.
Coolant temperature
warning light comes on
momentarily.
U5LP61.book Page 7 Monday, August 27, 2001 3:49 PM

5-17
EBU00497
Coolant
Check the coolant level in the reservoir tank when
the engine is cold. (The coolant level will vary with
engine temperature.) The coolant level is satisfac-
tory if it is between the “FULL” and “LOW” marks
on the tank. If the coolant level is at or below the
“LOW” level, add tap water (soft water) to bring the
level up to “FULL”. Change the coolant every two
years. (See pages 8-31 ~ 8-39 for details.)CAUTION:
Hard water or salt water is harmful to the en-
gine. You may use distilled water if you can’t
get soft water. Reservoir tank capacity:
0.29 L
From “LOW” to “FULL” level:
0.17 L
U5LP61.book Page 17 Monday, August 27, 2001 3:49 PM

8-31 1. Coolant reservoir cap
2. Maximum level mark
3. Minimum level mark
1. Bouchon du vase d’expansion
2. Repère de niveau maximum
3. Repère de niveau minimum
1. Tapa del depósito de líquido refrigerante
2. Marca de nivel máximo
3. Marca de nivel mínimo
EBU01015
Cooling system
1. Check the coolant level in the coolant reser-
voir when the engine is cold as the coolant
level will vary with engine temperature. The
coolant level should be between the maxi-
mum and minimum marks.
2. If the level is low, remove the coolant reser-
voir cap, and then add coolant or distilled wa-
ter to raise it to the specified level.CAUTION:_ Hard water or salt water is harmful to the en-
gine. You may use soft water if you can’t get
distilled water. _NOTE:_

If water is added, have a Yamaha dealer
check the antifreeze content of the coolant as
soon as possible.


The radiator fan operation is completely auto-
matic. It is switched on or off according to the
coolant temperature in the radiator.
_If your ATV overheats, see page 8-122 for details.Coolant reservoir capacity:
0.29 L
U5LP61.book Page 31 Monday, August 27, 2001 3:49 PM

10-5
Wheel travel:
Front
Rear230 mm
220 mm
Electrical:
Ignition system
Generator system
Battery type/voltage capacityDC-C.D.I.
A.C. Magneto
YTX14-BS/12 V, 12 Ah
Headlight type Krypton bulb
Bulb voltage, wattage
× quantity:
Headlight
Tail/brake light
Indicator/warning lights:
Neutral
Reverse
Coolant temperature12 V, 30 W/30 W
× 2
12 V, 5 W/21 W
× 1
12 V, 1.7 W
× 1
12 V, 1.7 W
× 1
12 V, 1.7 W
× 1
Fuse 20 AMODEL YFM660R
U5LP61.book Page 5 Monday, August 27, 2001 3:49 PM