Secondary Air Supply System (California Model Only) - Honda Hawk GT NT650 1988 Service Manual

FUEL SYSTEM
SECONDARY AIR SUPPLY SYSTEM
(California model only)
SYSTEM INSPECTION
Start the engine and warm it up to normal operating tempera-
ture.
Disconnect the secondary air intake hose from the air cleaner
case.
NOTE
• Do not disconnect the fuel tubes from the tank.
(2)
AIR INTAKE HOSE (3) AIR CLEANER
Check that the secondary air intake ports are clean and free of
carbon deposits.
Check the secondary air intake hose for clogging, deterioration
or damage and replace if necessary.
Check the reed valves in the air suction valve (ASV) if the
intake hose or supply hose is damaged by exhaust gas.
Disconnect the vacuum tube (No.1 0) from the ASV and install
a plug in the vacuum tube to keep air from entering.
Connect the vacuum pump to the ASV.
TOOL:
Vacuum/Pressure pump
Vacuum pump
A937X - 041 - XXXXX or
ST-AH-260-MC7
(U.S.A. only)
Start the engine and open the throttle slightly to be certain that
air is sucked in through the intake hose.
If air is not drawn in, check the air supply hoses and vacuum
tube for clogging. • ,
With the engine running, gradually apply vacuum to the ASV.
Check that the air intake hose stops drawing air, and that the
vacuum does not bleed off.
SPECIFIED VACUUM:
300-370 mm (11.8-14.6 in) Hg
If air is still drawn in, or if the specified vacuum is not main-
tained, install a new ASV.
If afterburn occurs on deceleration, even when the secondary
air supply system is normal, check the air cut-off valve for cor-
rect vacuum operation.
4-18
VACUUM HOSE ROUTING DIAGRAM
ENGINE FAMIlY-JHN064742G9 TO AIRIC
t
EVAPORATIVE FAMLY-88Z0 CV
CALIFORNIA VEHiClE