people 250 s 2 Workshop-manual : Page 240

          20. EXHAUST EMISSION CONTROL
    SYSTEM                                                                    PEOPLE/PEOPLE S 250



 SCHEMATIC DRAWING


                                              Carburetor                                 Air Injection
                                                                     Vacuum              Cut-off Valve




                                                                    Reed Valve




                                                                           Secondary
                                                         Secondary Air     Air Cleaner
                                                         Cleaner Into Hole




 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 prevent
 Secondary Air
                      Filter secondary air.   dirt or dust from affecting the operation of the air
 Cleaner
                                              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
                      Prevent exhaust
 Air Injection Cut-                           to reduce CO. When the throttle valve closes
                      muffler noise and
 off Valve                                    suddenly, the air injection cut-off valve is actuated
                      backfiring at sudden
                                              by vacuum to close and cut off secondary air in
                      deceleration.
                                              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
                      air inlet to reduce CO.
                                              into the exhaust system for re-combustion.




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