KYMCO People Service Manual page 240

20
. EXHAUST EMISSION CONTROL
SYSTEM
SCHEMATIC DRAWING
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
Filter secondary air.
Cleaner
Prevent exhaust
Air Injection Cut-
muffler noise and
off Valve
backfiring at sudden
deceleration.
Control the secondary
Reed Valve
air inlet to reduce CO.
Carburetor
Purpose
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.
PEOPLE/PEOPLE S 250
Vacuum
Reed Valve
Secondary
Secondary Air
Air Cleaner
Cleaner Into Hole
Function
Air Injection
Cut-off Valve
20-1