Honda LEAD 110 2009 Service Manual page 189

COOLING SYSTEM
INSPECTION
Visually inspect the thermostat for damage.
Replace the thermostat if the valve stays open at
room temperature.
Heat a pan of water with an electric heating element
Do not let the
to operating temperature for 5 minutes.
thermostat or
Suspend the thermostat in the heated water to
thermometer touch
check its operation.
the pan, or you will
get false readings.
THERMOSTAT BEGINS TO OPEN:
74.5 – 77.5 °C (166 – 172 °F)
VALVE LIFT:
3.5 mm (0.1 in) minimum at 85 °C (185 °F)
Replace the thermostat if it responds at tempera-
tures other than those specified.
INSTALLATION
Install the thermostat by aligning its body (spring
stopper) with the thermostat housing slot.
Install the dowel pins.
7-14
THERMOSTAT
3.5 mm
(0.1 in)
Align
DOWEL
PINS
THERMOMETER
VALVE
THERMOSTAT