1999 YAMAHA YZF-R7 engine overheat

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INSTRUMENT AND CONTROL FUNCTIONS
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1. Warning light
2. Oil level symbol “ ”
3. Coolant temperature symbol “ ”
4. Engine trouble symbol “ ”
EAU01564
Warning light
This indicator light has three functions.
l
The light will come on and symbol
“ ” will flash if the engine oil
level is low.
If this symbol flashes, stop the en-
gine immediately and fill it with oil
to the specified level.
l
The light will come on and symbol
“ ” will flash if trouble occurs in
a monitoring circuit. In such a
case, take the motorcycle to a
Yamaha dealer to have the self-
diagnostic systems checked.
l
The light will come on and symbol
“ ” will flash if the coolant tem-
perature is too high. The following
chart shows the conditions of the
indicator light, symbol and tem-
perature display in accordance to
coolant temperature.
The light circuit can be checked by the
procedure on page 1-6.
EC000118
CAUTION:

l
Do not run the motorcycle until
you know it has sufficient en-
gine oil.
l
Do not run the motorcycle if the
engine is overheated.
NOTE:

Even if the oil is filled to the specified
level, the indicator light may flicker
when riding on a slope or during sud-
den acceleration or deceleration, but
this is normal.
CB-74ECB-74E
Coolant
temperatureDisplay Conditions What to do
~ 39 ˚CSymbol is on and “LO” is
displayed.OK. Go ahead with riding.
40 ˚C ~ 120 ˚CSymbol is on and temper-
ature is displayed.OK. Go ahead with riding.
121 ˚C ~ 139 ˚CSymbol and temperature
flash.
Warning light comes on.Stop the motorcycle and al-
low it to idle until coolant tem-
perature goes down.
If the temperature does not
go down, stop the engine.
140 ˚C ~ Symbol and message
“HI” flash.
Warning light comes on.Stop the engine and allow it
to cool. Seen page 1-19 if the
engine overheats.
—Symbol and message
“Err” flash.
Warning light comes on.Ask a Yamaha dealer to in-
spect the motorcycle.
C
C
C
C
C

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INSTRUMENT AND CONTROL FUNCTIONS
Warning light circuit check
CB-75ECB-75E
Warning light comes on. After a few seconds:Warning light does not come on.
Have a Yamaha
dealer inspect the
electrical circuit.
Turn the main switch to “ON”.
Have a Yamaha dealer inspect
the electrical circuit.
If symbol “ ” is on, check the
engine temperature. (See page 1-5.)
Warning light goes off.
No symbol is on.Symbol “ ”,
“ ” “ ” is on.
OK. Go ahead
with riding.
Warning light does not go off.
If symbol “ ”
is on, inspect the
oil level.
Oil level is OK.Oil level is low.
Have a Yamaha dealer
inspect the electrical
circuit.Supply
recommended
engine oil.
If the engine is hot,
allow it to cool and see
“Engine overheating”
in the troubleshooting
chart on page 1-19 for
instructions.If the engine
temperature is
normal, have a
Yamaha dealer
inspect the
electrical circuit.
If symbol “ ” is on.
Have a Yamaha dealer
inspect the self-
diagnostic systems.

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TROUBLESHOOTING CHART
5. Engine overheatingEW000070
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. 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 counterclockwise and remove it.
NOTE:
If it is difficult to get the recommended coolant, tap water can be temporarily used, provided that it is changed to the recom-
mended coolant as soon as possible.
Wait until the
engine has cooled.Check the coolant level in the
reservoir tank and/or radiator.
Level is OK.
Level is low, check the
cooling system for leakage.
No
leakage.
Leakage.Ask a Yamaha dealer to inspect
and repair the cooling system.
Add coolant. (See NOTE.)
Restart the engine. If the engine overheats again, ask a
Yamaha dealer to inspect and repair the cooling system.

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CHK
ADJBLEEDING THE HYDRAULIC CLUTCH SYSTEM/
CLEANING THE AIR FILTER ELEMENT
j. Tighten the bleed screw to specifica-
tion.
k. Fill the clutch fluid reservoir to the
proper level with the recommended
clutch fluid.
Refer to “CHECKING THE CLUTCH
FLUID LEVEL”.
WARNINGWARNING
After bleeding the hydraulic clutch sys-
tem, check the clutch operation.
s s s s s s s s s s s s s s s s s s s s s s s s s s s
T R..
Bleed screw
6 Nm (0.6 m • kg, 4.3 ft • lb)
EB303130
CLEANING THE AIR FILTER ELEMENT
1. Remove:
• fuel tank
• air filter case cover
• air filter element
Refer to “FUEL TANK AND AIR FIL-
TER”.
2. Clean:
• air filter element
Apply compressed air to the outer sur-
face of the air filter element.
3. Check:
• air filter element
Damage ® Replace.
4. Install:
• air filter element
• air filter case cover
ACHTUNG:CAUTION:
Never operate the engine without the
air filter element installed. Unfiltered air
will cause rapid wear of engine parts
and may damage the engine. Operating
the engine without the air filter element
will also affect the electronic fuel injec-
tion, leading to poor engine perfor-
mance and possible overheating.
5. Install:
• fuel tank
Refer to “FUEL TANK AND AIR FIL-
TER”.