Radiator Cap/System Pressure Inspection; Coolant Replacement - Honda 2003 NPS50 Ruckus Service Manual

COOLING SYSTEM
RADIATOR CAP/SYSTEM PRESSURE
INSPECTION
Remove the radiator cap.
Wet the sealing surfaces of the cap, then install the
cap onto the tester.
Pressurize the radiator cap using the tester.
Replace the radiator cap if it does not hold pressure,
or if relief pressure is too high or too low.
The cap must hold the specified pressure for at least
6 seconds.
RADIATOR CAP RELIEF PRESSURE:
108 - 137 kPa (1.1 - 1.4 kgf/cm2, 1 6 - 20 psi)
Pressurize the radiator, engine and hoses using the
tester, and check for leaks.
Repair or replace -components if the system will not
hold the specified pressure for at least 6 seconds.
Remove the tester and install the radiator cap.
NOTICE
Excessive pressure can damage the cooling system
components. Do not exceed 137 kPa
psi).

COOLANT REPLACEMENT

PREPARATION
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 engi'ne damage.
NOTE:
The effectiveness of coolant decreases with the
accumulation of rust or if there is a change in the
mixing proportion during usage. Therefore, for
best performance change the coolant regularly
as specified in the maintenance schedule.
Mix only distilled, low mineral water with the rec-
om mended antifreeze.
RECOMMENDED ANTIFREEZE:
Pro Honda HP Coolant or an equivalent high qual­
ity ethylene glycol antifreeze containing corrosion
protection inhibitors specifically recommended
for use in aluminum engines
RECOMMENDED MIXTURE:
1:1 (distilled water and recommended antifreeze)
7-6
(1.4
kgf!cm', 20
ANTIFREEZE
SOLUTION
(ETHYLENE
GLYCOL BASE
SOLUTION)
LOW M I N ERAL
OR DISTILLED
WATER
COOLANT