I have an OLD B.S. engine that was off I think an OLD Yard Man rider! I move the TOP throttle lever(orange marker) and the governor moves, but the bottom throttle lever(at bottom) doesn't move! I move the bottom throttle lever and the governor doesn't move, nor does the throttle IN carburetor move! Is this the way it's supposed to be? The engine cover is SO rusted I can't read the model# or Type#! Does anybody know what model number this particular engine(8HP) is? Thanks!