Suzuki VL800 Service Manual page 307

CARBURETOR SURGE CONTROL VALVE
• Remove the carbretor surge control valve.
• Connect the vacuum pump to the vacuum port as shown.
• Apply the specified negative pressure to the carburetor surge
control valve.
• The specified negative pressure must be maintained.
• Replace the carburetor surge control valve if negative pres-
sure is not maintained.
! Negative pressure: 2.7 kPa (20 mm Hg)
" 09917-47010: Vacuum pump gauge
#
Use a hand operated vacuum pump to prevent the con-
trol valve damage.
• While applying the specified negative pressure to the carbure-
tor surge control valve vacuum port, blow air through the open
air port.
• Air should flow through the carburetor surge control valve and
out the air vent port A.
• Replace the carburetor surge control valve if air does not flow
out air vent port A.
• Plug the air vent port A.
• While applying the specified negative pressure to the carbure-
tor surge control valve vacuum port, blow air through the open
air port.
• Air should not flow through the carburetor surge control valve
and out the canister port B.
• Replace the carburetor surge control valve if air leaks out the
canister port B
EMISSION CONTROL INFORMATION 10-5
Air
A
B
Blocked tube