Honda Metropolitan CHF50 Service Manual page 117

COOLING SYSTEM
SERVICE INFORMATION
GENERAL
AWARNING
Removing the radiator cap while the engine is hot can allow the coolant to spray out, seriously scalding you.
Always let the engine and radiator cool down before removing the radiator cap.
NOTICE
Using coolant with silicate corrosion inhibitors may cause premature wear of water pump seals or blockage of radiator
passages. Using tap water may cause engine damage.
Add coolant at the reserve tank. Do not remove the radiator cap except to refill or drain the system.
All cooling system services can be done with the engine in the frame.
Avoid spilling coolant on painted surfaces.
After servicing the system, check for leaks with a cooling system tester.
When the coolant temperature exceeds 120 °C (248 °F), the coolant temperature indicator will blink. The ECM will then
control the ignition and reduce engine speed to 9 mph (15 km/h). At this time, check the cooling system and engine for
leaks or damage. If everything is OK, then check the coolant indicator circuit and thermosensor (page 18-14).
This scooter has adopted a magnetic-coupling water pump.
SPECIFICATIONS
ITEM
Coolant capacity Radiator and engine
Reserve tank
Radiator cap relief pressure
Thermostat Begin to open
Fully open
Valve lift
Standard coolant concentration
SPECIFICATIONS
0.3 liter (0.3 US qt, 0.3 Imp qt)
0.18 liter (0.2 US qt, 0.2 Imp qt)
108 - 137 kPa (1.1 - 1.4 kgf/cm
2
, 16 - 20 psi)
74-78°C(165-172°F)
100°C(212°F)
8 mm (0.3 in) minimum
50 % mixture with soft water
TORQUE VALUES
Coolant drain bolt
Radiator cover screw
0.9 N-m (0.1 kgfm, 0.7 Ibfft)
0.9 N-m (0.1 kgf-m, 0.7 Ibfft)
6-3