2000 YAMAHA YZF-R6 engine overheat

INSTRUMENT AND CONTROL FUNCTIONS
3-3
3
EAU01564
Oil level/coolant temperature indica-
tor light “ ”
This indicator light has two functions.l
The light will come on and symbol
“ ” will flash if the engine oil lev-
el is low. If this symbol flashes,
stop the engine immediately and
fill it with oil to the specified level.
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 3-5.
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 fislled 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. @
1. Oil level symbol “ ”
2. Oil level/coolant temperature
indicator light “ ”
3. Coolant temperature symbol “ ”E_5eb_Functions.fm Page 3 Thursday, November 18, 1999 4:03 PM

INSTRUMENT AND CONTROL FUNCTIONS
3-4
3
CB-77E
Coolant
temperatureDisplay Conditions What to do0°C ~ 40°C Symbol and “LO” are dis-
played.OK. Go ahead with riding.
41 °C ~ 117 °C Symbol and temperature
are displayed.OK. Go ahead with riding
118 °C ~ 140 °C Symbol and temperature
flash.
Indicator light comes on.Stop the motorcycle and allow it
to idle until coolant temperature
goes down.
If the temperature does not go
down, stop the engine. See
“Engine overheating” in the trou-
bleshooting chart on page 6-42
for instructions.
141 °C ~Symbol and “HI” flash.
Indicator light comes on.Stop the engine and allow it to
cool. See “Engine overheating”
in the troubleshooting chart on
page 6-42 for instructions.
˚C˚C˚C˚C
E_5eb_Functions.fm Page 4 Thursday, November 18, 1999 4:03 PM

INSTRUMENT AND CONTROL FUNCTIONS
3-5
3
EAU02987
Oil level / coolant temperature indicator light circuit check
CB-75E
Indicator comes on. After a few seconds:
Indicator 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 displayed, check the
engine temperature. (See page 3-4.)
Indicator goes off.
No symbol is on.
Symbol “ ” or
“” is displayed.
OK. Go ahead
with riding.
Indicator does not go off.If s ym b ol “ ” is
displayed, 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 6-42 for
instructions.
If the engine
temperature is
normal, have a
Yamaha dealer
inspect the
electrical circuit.
E_5eb_Functions.fm Page 5 Thursday, November 18, 1999 4:03 PM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-14
6
EC000080
CAUTION:@ Hard water or salt water is harmful
to the engine. You may use distilled
water if you can’t get soft water. @NOTE:@ If water is added, have a Yamaha deal-
er check the antifreeze content of the
coolant as soon as possible.
The radiator fan operation is complete-
ly automatic. It is switched on or off ac-
cording to the coolant temperature in
the radiator. @5. If your motorcycle overheats, see
page 6-42 for details.
EAU01612
Changing the coolant1. Remove panel C, cowling A and
cowling B. (See page 6-6 for re-
moval and installation proce-
dures.)
2. Place a container under the en-
gine.
3. Remove the radiator cap.4. Remove the water pump drain bolt
and drain the coolant from the wa-
ter pump housing.
5. Disconnect the radiator hose by
loosening the clamp and drain the
coolant completely.
6. Thoroughly flush the cooling sys-
tem with clean tap water.1. Radiator cap
1. Water pump drain bolt
2. Clamp bolt
E_5eb_Periodic.fm Page 14 Thursday, November 18, 1999 4:06 PM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-42
6
5. 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. 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.
E_5eb_Periodic.fm Page 42 Thursday, November 18, 1999 4:06 PM