Yamaha X-MAX 300 Owner's Manual page 100

Periodic maintenance and adjustment
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 ro-
tate the cap counterclockwise to the detent to allow any residual pres-
sure 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 engine
has cooled.
Check the coolant
level in the reservoir
and radiator.
7
TIP
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.
The coolant level is
low.
Check the cooling
system for leakage.
The coolant level is
OK.
7-37
There is leakage.
There is no leakage.
Start the engine. If the engine overheats again,
have a Yamaha dealer check and repair the cooling
system.
EWAT1041
Have a Yamaha
dealer check and
repair the cooling
system.
Add coolant.
(See TIP.)