Honda 2003 NPS50 Ruckus Service Manual page 61

MAINTENANCE
Remove the radiator cover (page 7-7).
Check the radiator air passage for clogs or damage.
Straighten bent fins with a small, flat blade screw­
driver and remove insects, mud or ather obstruc­
tions with compressed air o r low pressure water.
Replace the radiator if the air flow is restricted over
more than 20% of the radiating surface.
Install the radiator cover (page 7-8).
S ECONDARY AIR S U PPLY SYSTEM
('03 - '05 model)
Remove t h e floor step (page 3-7).
Check the air supply hose between the PAIR control
valve and PAIR check valve for damage or loose
connection.
If the hose shows any signs of heat damage, inspect
the PAIR check valve (page 6-23).
Check the vacuum hose between the intake mani­
fold vacuum joint and PAIR control valve for deteri­
oration, damage or loose connection.
Also check that the hose is not kinked or pinched.
Install the floor step (page 3-7).
4- 1 4
PAIR CONTROL VALVE
VACU UM HOSE
AIR SUPPLY HOSE
PAIR CHECI< VALVE