Secondary Air Supply System - Honda VT750C2 Shadow Spirit Service Manual

FUEL SYSTEM
SECONDARY AIR SUPPLY SYSTEM
SYSTEM INSPECTION
Warm up the engine to operating temperature.
Remove the fuel tank (page 3-4).
Check that the secondary air supply hoses are clean
and free of carbon deposits.
Check the PAIR check valves if the hoses are carbon
fouled (page 6-29).
Disconne,ct the PAIR control valve vacuum hose and
plug thevacuum hose.
Connect a vacuum pump to the PAIR control valve.
Install the fuel tank (page 3-4).
Start the engine and open the throttle slightly to be
certain that air is sucked in through the air suction
hose.
If the air is not drawn in, check the air suction hoses
for clogs.
With the engine running, gradually apply vacuum to
the PAIR control valve vacuum hose.
Check that the air suction hose stops drawing air,
and that the vacuum does not bleed. .
SPECIFIED VACUUM:
STANDARD SETTING: 65 kPa (485 mmHg)
HIGH ALTITUDE SETrlNG: 57 kPa (425 mmHg)
If the air is drawn in, or if the specified vacuum is
not maintained, install a new PAIR control valve.
If afterburn occurs on deceleration, even when the
secondary air supply system is normal, check the air
cut-off valve.
VACUUM PUMP
PLUG
AIR SUCTION HOSE
6-28