super 8 50 2t 1 Workshop-manual : Page 185

          17. EXHAUST EMISSION CONTROL
                                                                                  SUPER8 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.




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