1999 YAMAHA YZF-R7 overheating

1 - 6
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”.

3 - 57
CHK
ADJ
5. Charge:
• battery
(refer to the appropriate charging
method illustration)
WARNINGWARNING
Do not quick charge a battery.
ACHTUNG:CAUTION:
• Never remove the MF battery sealing
caps.
• Do not use a high-rate battery charger
since it forces a high-amperage cur-
rent into the battery quickly and can
cause battery overheating and bat-
tery plate damage.
• If it is impossible to regulate the
charging current on the battery
charger, be careful not to overcharge
the battery.
• When charging a battery, be sure to
remove it from the motorcycle. (If
charging has to be done with the bat-
tery mounted on the motorcycle, dis-
connect the negative lead from the
battery terminal.)
• To reduce the chance of sparks, do not
plug in the battery charger until the
battery charger leads are connected to
the battery.
• Before removing the battery charger
lead clips from the battery terminals,
be sure to turn off the battery charger.
• Make sure that the battery charger
lead clips are in full contact with the
battery terminal and that they are not
shorted. A corroded battery charger
lead clip may generate heat in the con-
tact area and a weak clip spring may
cause sparks.
• If the battery becomes hot to the
touch at any time during the charging
process, disconnect the battery
charger and let the battery cool before
reconnecting it. Hot batteries can
explode!
• As shown in the following illustration,
the open-circuit voltage of an MF bat-
tery stabilizes about 30 minutes after
charging has been completed. There-
fore, wait 30 minutes after charging is
completed before measuring the
open-circuit voltage.
(68 ˚F)
(68 ˚F)
CHECKING AND CHARGING THE BATTERY

5 - 7
COOL

RADIATOR AND THERMOSTAT
EB502020
CHECKING THE THERMOSTAT
1. Check:
• thermostat
1

Does not open at 71 ~ 85 ˚C (159.8 ~
185 ˚F)
®
Replace.
t t t t t t t t t t t t t t t t t t t t t t t t t t t
a. Suspend the thermostat in a con-
tainer filled with water.
b. Slowly heat the water.
c. Place a thermometer in the water.
d. While stirring the water, observe the
thermostat and thermometer’s indi-
cated temperature.
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
1
Thermostat
2
Thermometer
3
Water
4
Container

Fully closed
õ
Fully open
NOTE:

If the accuracy of the thermostat is in
doubt, replace it. A faulty thermostat
could cause serious overheating or
overcooling.
2. Check:
• thermostat housing cover
• thermostat housing
Cracks/damage
®
Replace.
EB502030
ASSEMBLING THE THERMOSTAT
ASSEMBLY
1. Install:
• thermostat housing
1

• thermostat
2

• thermostat housing cover
NOTE:

Install the thermostat with its breather
hole
a
facing up.
2
1
1
2
a a