grand dink 125 mmc 1 Workshop-manual : Page 243

          20. EXHAUST EMISSION CONTROL
    SYSTEM                                                              GRAND DINK 125/150


 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- muffler noise and       burned to reduce CO. When the throttle valve
 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.

                    Control the secondary Whenthe reed valve operatesis less than 50km per
                                                   the motorcycle speed
 Reed Valve                                 hour,                         to draw secondary air
                    air inlet to reduce CO.
                                            into the exhaust system for re-combustion.




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