Honda C8R600F4 Service Manual page 120

FUEL SYSTEM
5-38
Connect a vacuum pump to the PAIR control valve
vacuum tube (California: No. 10).
St::irt thA AnoinA and open the throttle slightly
to
be
certain that air is sucked in through the air supply
hose (California: No. 15).
If the air is not drawn in, check the air supply hoses
for clogging.
With the engine running, gradually apply vacuum
to the PAIR control valve vacuum tube.
Check that the air supply hose stops drawing air,
and that the vacuum does not bleed.
SPECIFIED VACUUM: 400 mm Hg (15.7 in Hg)
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.
PAIR CHECK VALVE INSPECTION
Remove the radiator without disconnecting the
water hoses (page 3-6).
Remove the bolts and PAIR check valve cover from
the cylinder head cover.
Remove the PAIR check valves.
AIR SUPPLY HOSES
PAIR CONTROL VALVE
VACUUM TUBE