Cooling System Service Information; Cooling System Torque Values; Radiator Cover - Honda 2003 NPS50 Ruckus Service Manual

S ERVICE I N FORMATION
GENERAL
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
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Using coolant with silicate corrosion inhibitors may cause premature wear of water pump seals or blockage of radiator
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passages. Using tap water may cause engine damage.
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Add coolant at the reserve tank. Do not remove the radiator cap except to refill o r drain the system.
All cooling system services can be done with the engine in the frame.
Avoid spilling coolant on painted surfaces.
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After servicing the system, check for leaks with a cooling system tester.
When the coolant temperature exceeds 120 oc (248 °F), the coolant temperature indicator will blink. The ECM will then
control the ignition and reduce engine speed to 9 mph ( 1 5 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 1 9-15).
This scooter features a magnetic-coupling water pump.
SPECIFICATIONS
Coolant capacity
Radiator cap relief pressure
Thermostat
Standard coolant concentration
TORQUE VALUES
Radiator drain bolt
Radiator cover screw
ITEM
Radiator and engine
Reserve tank
Begin to open
Fully open
Valve lift
1.0 N·m (0.1 kgf·m, 0.7 lbf·ft)
1.0 N·m (0.1 kgf·m, 0.7 lbf·ft)
COOLING SYSTEM
ST ANDARD
0.48 liter (0.51 US qt, 0.42 Imp qt)
0.28 liter (0.30 US qt, 0.25 Imp qt)
108 - 1 37 kPa (1.1 - 1.4 kgf/cm2, 1 6 - 20 psi)
74 78 "C (165 172 °F)
100 "C (212 °F)
8 mm (0.3 in) minimum
1:1 mixture with soft water
7-3