17. EXHAUST EMISSION CONTROL SYSTEM AGILITY RS 50 NAKED 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