Pulse Secondary Air Supply (Pair) System; Evaporative Emission Control System - Honda Motorcycle Service Manual

MAINTENANCE
PULSE SECONDARY AIR SUPPLY (PAIR)
SYSTEM
hands and clothing away
tart automatically, without
1
NOTE
-
The pulse secondary air supply system introduces filtered
air into the exhaust gases in the exhaust port. The
secondary air is drawn into the exhaust port whenever
there is a negative pressure pulse in the exharst system
This charged secondary air promotes burning of the
unburned exhaust gases and changes a considerable
amount of hydrocarbons and carbon monoxide into
&ly harmless carbon dioxide and water.
Check the air supply tubes between the valve and exhaust
ports for deterioration, damage, or loose connections. Make
sure the tubes are not kinked, pinched, or cracked.
NOTE
/ h e tubes show any signs of heat damage, i n s ~ e c t the
/
. .
reed valve in the system for damage.
Check the vacuum hose between the intake pipe and valve for
deterioration, damage or a loose connection. Make sure the
hose is not kinked, pinched, or cracked.
Refer to the vacuum hose routing diagram label for hose
connections.
EVAPORATIVE EMISSION CONTROL
SYSTEM
.
To prevent injury, keep your hands and clothing away
from the cooling fan. It may start automatically, without
warnina.
NOTE
Fuel vapor from the fuel tank is directed into the
evaporative emission canister while the engine is stopped.
When the engine is running, the evaporative emission
purge control valve opens and fuel vapor in the evaporative
emission canister is drawn into the engine through the
carburetor. The tubes deteriorate naturally due to wear and
time. Check the condition of these tubes at the intervals
specified in the Model Specific manual.
Check the hoses between the fuel tank, evaporative emission
canister, evaporative emission purge control valve,
evaporative emission carburetor air vent control valve and
carburetors for deterioration, damage or loose connections.
Check the evaporative emission canister for cracks or other
damage.
Refer to the vacuum routing diagram label for hose
connections
VLCUM HOSE
ROUTING
DIAGRAM
EHOlHE FAMILY RHHSBPAGPM
1YIWRATlYE FAMILY RHXIOXDHMOH
CILlfORHlA VEHICLE
Date of Issue : March, 1995
0
HONDA MOTOR CO.,LTD,