Exhaust Emission Control System; Service Information; Troubleshooting; Air Injection Cut-Off Valve (A.i.c.v.) - KYMCO Agility City 125 Service Manual

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18
. EVAPORATIVE/EXHAUST EMISSION
CONTROL SYSTEM

EXHAUST EMISSION CONTROL SYSTEM

The exhaust emission control system adopted in this model utilizes the reed valve to draw
secondary air into the exhaust system for re-combustion by means of exhaust pulsation so as to
minimize the exhaust emission.
FUNCTION
Item
Secondary Air
Cleaner
Air Injection Cut-
off Valve

Reed Valve

SERVICE INFORMATION

GENERAL INSTRUCTIONS
During operation, be careful to avoid scalding caused by the exhaust muffler.
Note the locations of tubes for proper installation.
Replace any damaged tube with a new one.
Make sure to tighten the connector of each tube securely
TOOLS
Vacuum pump

TROUBLESHOOTING

High CO at idle speed
Damaged or clogged reed valve
Damaged or clogged air injection cut-off valve
Clogged air cleaner
Backfiring at sudden deceleration
Damaged reed valve (malfunction)
Faulty air injection cut-off valve (unable to close)
Carburetor incorrectly adjusted
Faulty air cut-off valve
Leaking vacuum tube
18-1
Recambios KYMCO en www.batmotos.com
Purpose
Filter secondary air.
Prevent exhaust
muffler noise and
backfiring at sudden
deceleration.
Control the secondary
air inlet to reduce CO.
Function
It filters the fresh air drawn for re-burning to
prevent dirt or dust from affecting the operation of
the air injection cut-off valve.
The air injection cut-off valve usually opens to
lead air into the exhaust muffler in which air is re-
burned to reduce CO. When the throttle valve
closes suddenly, the air injection cut-off valve is
actuated by vacuum to close and cut off secondary
air in order to prevent exhaust muffler backfiring
due to air in the exhaust system.
When the motorcycle speed is less than 50km per
hour, the reed valve operates to draw secondary air
into the exhaust system for re-combustion.
SPECIFICATIONS
Air injection cut-off valve actuating pressure
250mm/Hg 30 liter/min.
Reed valve stopper clearance 6.6mm
Exhaust muffler noise
Faulty air injection cut-off valve
Broken vacuum tube
Faulty reed valve