Sym HD 125 Service Manual page 142

Inspection
Visually inspect thermostat for any damage.
Place the thermostat into heated water to check its
operation.
Caution
Whenever the thermostat and the thermometer
are in contact to the wall of heated water
container, the reading displayed is incorrect. If
the valve of the thermostat remains open at
room temperature or the valve operation is not
corresponding to the temperature change, then
it must be replaced.
Technical Data
Valve begins to open
Valve stroke
Assembly
Install in reverse order of removal.
Caution
Always use a new O-ring and apply a coat of
grease on it before installing.
Refill the specified coolant as necessary.
To this chapter contents
71 ~ 80¢ J
3.5 ~ 4.5 mm at 80¢ J
12. COOLING SYSTEM
12-13