HYOSUNG 2010 ST7 Service Manual page 170

6-1 COOLING SYSTEM
ENGINE COOLANT
At the time of manufacture, the cooling system is filled
with a 50 : 50 mixture of distilled water and ethylene gly-
col anti-freeze.
This 50 : 50 mixture will provide the optimum corrosion
protection and excellent heat protection, and will protect
the cooling system from freezing at temperatures above
31 ( 24 ).
If the motorcycle is to be exposed to temperatures
below 31 ( 24 ), this mixing ratio should be
increased up to 55% or 60% according to the figure.
CAUTION
Use a high quality ethylene glycol base anti-
freeze, mixed with distilled water. Do not mix
an alcohol base anti-freeze and different
brands of anti-freeze.
Do not rut in more than 60% anti-freeze or less
than 50%. (Refer to Right figure.)
Do not use a radiator anti-leak additive.
50% Engine coolant including reserve tank capacity
Anti-freeze
Water
You can be injured by scalding fluid or steam if you open the radiator cap when the engine is hot. After the
engine cools, wrap a thick cloth around cap and carefully remove the cap by turning it a quarter turn to
allow pressure to escape and then turn the cap all the way off.
The engine must be cool before servicing the cooling system.
Coolant is harmful ;
If it comes in contact with skin or eyes, flush with water.
If swallowed accidentally, induce vomiting and call physician immediately.
Keep it away from children.
0.8
0.8
WARNING
Anti-freeze density
50%
55%
60%
Fig.1 Engine coolant density-freezing
point curve.
Density (%)
Fig.2 Engine coolant density-boiling
point curve.
Freezing point
31 ( 24 )
40 ( 40 )
55 ( 67 )
Density (%)