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17. EXHAUST EMISSION CONTROL
LIKE 50 2T
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 Purpose Function
It filters the fresh air drawn for re-burning to
Secondary Air
Filter secondary air. prevent dirt or dust from affecting the operation of
Cleaner
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-
Prevent exhaust
Air Injection Cut- burned to reduce CO. When the throttle valve
muffler noise and
off Valve closes suddenly, the air injection cut-off valve is
backfiring at sudden
actuated by vacuum to close and cut off secondary
deceleration.
air in order to prevent exhaust muffler backfiring
due to air in the exhaust system.
When the motorcycle speed is less than 50km per
Control the secondary
Reed Valve hour, the reed valve operates to draw secondary
air inlet to reduce CO.
air into the exhaust system for re-combustion.
17-1