engine overheat YAMAHA YZF-R1 2002 Owners Manual

INSTRUMENT AND CONTROL FUNCTIONS
3-4
3
EAU04559
Engine speed indicator light
The electrical circuit of the indicator
light can be checked according to the
following procedure.
1. Turn the key to “ON”.
2. If the indicator light does not come
on for a few seconds, then go off,
have a Yamaha dealer check the
electrical circuit. (See pages 3-8–
3-10 for a detailed explanation of
the function of this indicator light
and on how to set it.)
EAU04515
Coolant temperature warning light
“”
This warning light comes on when the
engine overheats. When this occurs,
stop the engine immediately and allow
the engine to cool.
The electrical circuit of the warning light
can be checked according to the fol-
lowing procedure.
1. Turn the key to “ON”.
2. If the warning light does not come
on for a few seconds, then go off,
have a Yamaha dealer check the
electrical circuit.
EC000002
CAUTION:_ Do not operate the engine if it is
overheated. _
1. Engine speed indicator light
2. Coolant temperature warning light “”
3. Coolant temperature display
U5PWE0.book Page 4 Friday, December 7, 2001 5:14 PM

INSTRUMENT AND CONTROL FUNCTIONS
3-5
3
CB-25E
Coolant
temperatureDisplay Conditions What to do0–39 °C Message “LO” is
displayed.OK. Go ahead with riding.
40–116 °C Temperature is
displayed.OK. Go ahead with riding.
117–139 °C Temperature flashes.
Warning light comes on.Stop the motorcycle and allow it to
idle until the coolant temperature
goes down.
If the temperature does not go
down, stop the engine. (See the
“Engine overheating” section on
page 6-46 for further instructions.)
Above 140 °C Message “HI” flashes.
Warning light comes on.Stop the engine and allow it to cool.
(See the “Engine overheating” sec-
tion on page 6-46 for further in-
structions.)
U5PWE0.book Page 5 Friday, December 7, 2001 5:14 PM

OPERATION AND IMPORTANT RIDING POINTS
5-3
5
EAU02937
Recommended shift points
(for Switzerland only) The recommended shift points during
acceleration are shown in the table be-
low.CF-02ENOTE:_ When shifting down two gears at a
time, reduce the speed accordingly
(e.g., down to 35 km/h when shifting
from 5th to 3rd gear). _
EAU03952
Tips for reducing fuel
consumption Fuel consumption depends largely on
your riding style. Consider the following
tips to reduce fuel consumption:

Thoroughly warm up the engine.


Shift up swiftly, and avoid high en-
gine speeds during acceleration.


Do not rev the engine while shift-
ing down, and avoid high engine
speeds with no load on the engine.


Turn the engine off instead of let-
ting it idle for an extended length
of time (e.g., in traffic jams, at traf-
fic lights or at railroad crossings).
EAU01128
Engine break-in There is never a more important period
in the life of your engine than the period
between 0 and 1,600 km. For this rea-
son, you should read the following ma-
terial carefully.
Since the engine is brand new, do not
put an excessive load on it for the first
1,600 km. The various parts in the en-
gine wear and polish themselves to the
correct operating clearances. During
this period, prolonged full-throttle oper-
ation or any condition that might result
in engine overheating must be avoided.
Shift point
(km/h)
1st→2nd
2nd→3rd
3rd→4th
4th→5th
5th→6th20
30
40
50
60
U5PWE0.book Page 3 Friday, December 7, 2001 5:14 PM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-13
6
EC000080
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 cool-
ant as soon as possible, other-
wise the engine may not be
sufficiently cooled and the cool-
ing system will not be protected
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 possible,
otherwise the effectiveness of
the coolant will be reduced.
_
EW000067
WARNING
_ Never attempt to remove the radia-
tor cap when the engine is hot. _
NOTE:_

The radiator fan is automatically
switched on or off according to the
coolant temperature in the radia-
tor.


If the engine overheats, see page
6-46 for further instructions.
_
EAU04524
To change the coolant
1. Place the motorcycle on a level
surface and let the engine cool if
necessary.
2. Remove cowlings A and B, and
panel A. (See pages 6-5–6-7 for
cowling and panel removal and in-
stallation procedures.)
3. Place a container under the en-
gine to collect the used coolant.
4. Remove the radiator cap and cool-
ant reservoir cap.
EW000067
WARNING
_ Never attempt to remove the radia-
tor cap when the engine is hot. __1. Coolant reservoir cap
2. Radiator cap
U5PWE0.book Page 13 Friday, December 7, 2001 5:14 PM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-46
6 Engine overheating
EW000070
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 hiss-
ing sound has stopped, press down on the cap while turning it counterclockwise, and then remove the cap.
_CT-2AENOTE:_ 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. _
Wait 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.
U5PWE0.book Page 46 Friday, December 7, 2001 5:14 PM