quannon 125 Workshop-manual : Page 49

          4. FUEL SYSTEM                                                                QUANNON 125

                                                                          A.C.V.
 AIR CUT-OFF VALVE (A.C.V.)
 REMOVAL
 Remove the throttle stay plate set.
 Disconnect the tubes that go to the air cut-off
 valve.
 Remove the two attaching screws.
 Remove the air cut-off valve.




                                                            Screws
                                                                              Spring
 DISASSEMBLY
 Remove the two attaching screws to remove
 the air cut-off valve cover.
 Remove the spring and diaphragm.

 INSPECTION
 Inspect the check valve for proper operation.
 Inspect the air cut-off valve diaphragm and
 O-ring for deterioration or damage.
 Replace with new ones if necessary.
 Clean each air passage with compressed air.
                                                        Diaphragm                 Screws
 THROTTLE POSITION SENSOR                                V/R                   V/B
 INSPECTION
 Measure the resistance on the T.P.S. of
 terminals.
   Wire Color        Full Open        Full Close
    V/R-V/G         4.8~6.2k         4.8~6.2k
    V/B-V/G        4.16~6.24k       1.47~2.21k
     V/R-V/B        2.3~3.5k         5.1~7.5k



                                                   Throttle Position Sensor        V/G

 AUTO BYSTARTER INSPECTION
 Measure the resistance between the auto
 bystarter wire terminals.
 Resistance:        14-20 (10 minutes
 minimum after stopping the engine)
 If the reading is not within the limit, replace
 the auto bystarter with a new one.




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