Yamaha YZF-R25 Owner's Manual page 87

Engine overheating
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.
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 hissing sound has stopped, press down on the cap
while turning it counterclockwise, and then remove the cap.
Wait until the
Check the coolant level in
engine has cooled.
the reservoir and radiator.
TIP
If coolant is not available, tap water can be temporarily used instead, provided that it is changed to the recommended
cool-ant as soon as possible.
PERIODIC MAINTENANCE AND ADJUSTMENT
The coolant level is low.
Check the cooling
system for leakage.
The coolant
level is OK.
7-42
There is Have a Yamaha dealer check
leakage. and repair the cooling system.
There is
Add coolant. (See TIP.)
no leakage.
Start the engine. If the engine overheats again, have a
Yamaha dealer check and repair the cooling system.
7