Adopting the pendulum mechanism,BOPU concrete poker CMV series tranlsate the running speed of engine from 3000 rpm into 12000 vibrationsper minute in the poker head via the flexible shaft.The gasoline engine eusures that the CMVAseriescan work as well inwhatsoever working site without access toelectrical power. Either Robin,Honda or Lifan (Chinese engine) is optional at different prices.