KYMCO SR25BA - Exhaust Emission Control System Function

18. EVAPORATIVE / EMISSION CONTROL SYSTEM Movie S 125i
18-7
EMISSION CONTROL SYSTEM
a
Air cleaner Reed valve
Secondary air intake tube
Catalytic converter
AICV Air Injection Cut-off Valve
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
Purpose Function
Secondary Air
Cleaner
Filter secondary air.
It filters the fresh air drawn for re-burnin
g
to
p
revent dirt or dust from affectin
g
the o
p
eration of
the air injection cut-off valve.
Air Injection Cut-
off Valve
Prevent exhaust
muffler noise and
backfiring at sudden
deceleration.
The air in
j
ection cut-off valve usuall
y
o
p
ens to
lead air into the exhaust muffler in which air is re-
b
urned to reduce CO. When the throttle valve
closes suddenl
y
, the air in
j
ection cut-off valve is
actuated b
y
vacuum to close and cut off secondar
y
air in order to
p
revent exhaust muffler backfirin
g
due to air in the exhaust system.
Reed Valve
Control the secondar
y
air inlet to reduce CO.
When the motorc
y
cle s
p
eed is less than 50km
p
e
r
hour, the reed valve o
p
erates to draw secondar
y
ai
r
into the exhaust system for re-combustion.