2000 YAMAHA DT125R engine overheat

3-4
INSTRUMENT AND CONTROL FUNCTIONS
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23
4
5
6
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8
9
EAU00127
Turn signal switch
To signal a right-hand turn, push the
switch to Ò6Ó. To signal a left-hand
turn, push the switch to Ò4Ó. Once
the switch is released it will return to
the center position. To cancel the sig-
nal, push the switch in after it has
returned to the center position.
EAU00129
Horn switch Ò*Ó
Press the switch to sound the horn.
1
2
1.Coolant temperature gauge
2.Red zone
EAU01652
Coolant temperature gaugeThis gauge indicates the coolant tem-
perature when the main switch is on.
The engine operating temperature
will vary with changes in weather and
engine load. If the needle points to
the red zone or higher, stop your
motorcycle and let the engine cool.
(See page 6-13 for details.)
EC000002
cCWhen the engine is overheated, do
not continue riding.
2
1
3
4
1.Lights switch
2.Dimmer switch
3.Turn signal switch
4.Horn switch Ò*Ó
EAU00118
Handlebar switches
EAU00134
Lights switch
Turning the light switch to Ò
'
Ó,
turns on the auxiliary light, meter
lights and taillight. Turning the light
switch to Ò:Ó, turns the headlight on
also.
EAU00121
Dimmer switch
Turn the switch to Ò&Ó for the high
beam and to Ò%Ó for the low beam.
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6-13
PERIODIC MAINTENANCE AND MINOR REPAIR
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8
9
EAU01808
Cooling system1.Remove panel D. (See page 6-9
for panel removal and installation
procedures.)
2.Check the coolant level in the
reservoir tank when the engine is
cold as the coolant level will vary
with engine temperature. The
coolant level should be between
the maximum and minimum
marks.
3.If the level is low, add coolant or
distilled water to raise it to the
specified level.4.Install the panel.
EC000080
cCHard water or salt water is harmful
to the engine. You may use dis-
tilled water if you canÕt get soft
water.NOTE:
If water is added, have a Yamaha
dealer check the antifreeze content of
the coolant as soon as possible.If your motorcycle overheats, see
page 6-41 for details.
2
1
1.Maximum level mark
2.Minimum level mark
EAU03101
Changing the coolant1.Put the motorcycle on a level
place.
2.Remove cowling C and panel D.
(See page 6-8 ~ 6-9 for cowling
and panel removal and installa-
tion procedures.)
3.Remove the radiator cap stopper
bolt and the radiator cap.
12
1.Stopper bolt
2.Radiator cap
Reservoir tank capacity:
0.35 L
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6-41
PERIODIC MAINTENANCE AND MINOR REPAIR
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4. Engine overheating
EW000070
wDo 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. Open the radiator cap as follows. Wait until the
engine has cooled. Remove the radiator cap stopper by removing the screw. Place a thick rag like a towel over
the radiator cap and slowly rotate the cap counterclockwise to the detent. This procedure allows any residual
pressure to escape. When the hissing sound has stopped, press down on the cap while turning counterclock-
wise and remove it.Wait until the
Check the coolant level in the
Level is OK.Level is low, check the
NoLeakage.
Ask a Yamaha dealer to inspectAdd coolant. (See NOTE.)
Restart the engine. If the engine overheats again, ask a
engine has cooled.reservoir tank and/or radiator.cooling system for leakage.
Yamaha dealer to inspect and repair the cooling system. leakage.
and repair the cooling system.
NOTE:
If it is difficult to get the recommended coolant, tap water can be temporarily used, provided that it is changed to the rec-
ommended coolant as soon as possible.
3MB-9-E7 12/27/00 2:52 PM Page 77