engine overheat YAMAHA DT125R 2005 Owners Manual

EAU11002
Indicator and warning lights
1. Turn signal indicator light “b”
2. Dimmer indicator light “j”
3. Neutral indicator light “N”
4. Oil level warning light “z”
EAU11030
Turn signal indicator lights “c” and
“d”
The corresponding indicator light flas-
hes when the turn signal switch is
pushed to the left or right.
EAU11070
Neutral indicator light “N”
This indicator light comes on when
the transmission is in the neutral posi-
tion.
EAU11080
High beam indicator light “j”
This indicator light comes on when
the high beam of the headlight is swit-
ched on.
EAU11180
Oil level warning light “z”
This warning light comes on when the
key is in the “ON” position or when
the oil level in the 2-stroke engine oil
tank is low during operation. If the
warning light comes on during opera-
tion, stop immediately and fill the oil
tank with Yamalube 2 or equivalent 2-
stroke engine oil of either JASO grade
“FC” or ISO grades “EG-C” or “EG-
D”. The warning light should go off
after the 2-stroke engine oil tank has
been refilled.
NOTE:
If the warning light does not come on
when the key is in the “ON” position
or does not go off after the 2-stroke
engine oil tank has been refilled, have
a Yamaha dealer check the electrical
circuit.
ECA10010
CAUTION
Do not operate the vehicle until you
know that the engine oil level is suf-
ficient.
EAU11430
Coolant temperature warning light
“y”
This warning light comes on when the
engine overheats. When this occurs,
stop the engine immediately and
allow the engine to cool.
ECA10020
CAUTION
Do not operate the engine if it is
overheated.
0km/h406080
100
120
130 20
y
00001
5
0008
bj
zN
3
INSTRUMENT AND CONTROL FUNCTIONS
3-2
1
234
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NOTE:
The coolant should be between the
minimum and maximum level marks.
4. If the coolant is at or below the
minimum level mark, open the
reservoir cap, add coolant to the
maximum level mark, and then
close the reservoir cap.
Coolant reservoir capacity:
0,3 L (0,32 US qt)
ECA10470
CAUTION
If coolant is not available, use
distilled water or soft tap water
instead. Do not use hard water
or salt water since it is harmful
to the engine.
If water has been used instead
of coolant, replace it with coo-
lant as soon as possible, other-
wise the engine may not be
sufficiently cooled and the coo-
ling system will not be protec-
ted against frost and corrosion.
If water has been added to the
coolant, have a Yamaha dealer
check the antifreeze content of
the coolant as soon as possi-
ble, otherwise the effective-
ness of the coolant will be
reduced.
EWA10380
s s
WARNING
Never attempt to remove the radia-
tor cap when the engine is hot.
5. Install the panel.
NOTE:
If the engine overheats, see page
6-31 for further instructions.
EAU20370
To change the coolant
1. Radiator cap bolt
2. Radiador cap
1. Put the vehicle on a level place.
2. Remove cowling C and panel D.
(See page 6-5 ~ 6-6.)
3. Remove the radiator cap stopper
bolt and the radiator cap.
1. Drain bolt
4. Place a container under the engi-
ne and remove the coolant drain
bolt.
5. Disconnect the coolant reservoir
hose on the reservoir side and
drain the coolant from the reser-
voir.
6. After draining the coolant, tho-
roughly flush the cooling system
with clean tap water.
7. Replace the coolant drain bolt
washer if it is damaged, and then
tighten the coolant drain bolt to
the specified torque.6
PERIODIC MAINTENANCE AND MINOR REPAIR
6-9
2
11
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NOTE:
If coolant is not available, tap water can be temporarily used instead, provided that it is changed to the recommended
coolant as soon as possible.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-31
6Wait until the
engine has cooled.Check the coolant level in the
reservoir and radiator.
The coolant level
is OK.
The coolant level is low.
Check the cooling system
for leakage.
Have a Yamaha dealer checkand repair the cooling system.
Add coolant. (See NOTE.)
Start the engine. If the engine overheats again, have a
Yamaha dealer check and repair the cooling system.
There is
leakage.
There is
no leakage.
Engine overheatingEWA10400
s s
WARNING
Do not remove the radiator cap when the engine and radiator are hot. Scalding hot fluid and steam may be
blown out under pressure, which could cause serious injury. Be sure to wait until the engine has cooled.
After removing the radiator cap retaining bolt, place a thick rag, like a towel, over the radiator cap, and then
slowly rotate the cap counterclockwise to the detent to allow any residual pressure to escape. When the his-
sing sound has stopped, press down on the cap while turning it counterclockwise, and then remove the cap.
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