PURPOSE: To prevent the unloaded excessive revolution by opening/closing-controlling and electromagnetic opening/closing valve on the basis of the signal of the primary coil of a flywheel magneto, in an engine having an electromagnetic opening/closing valve in a passage connecting the fuel chamber of a carburetor and an intake passage.
CONSTITUTION: A high speed control mechanism is equipped with a diaphragm type fuel pump A and a fuel feeding mechanism B on the body 4 of a carburetor 1. Further, an electromagnetic opening/closing valve C for opening and closing a passage between the fuel feeding mechanism B and the fuel storage chamber 10 of the carburetor 1 and an electric control circuit 37 which controls the operation of the electromagnetic opening/closing valve C on the basis of the signal of the primary coil of the flywheel magneto 30 of an engine 31 are provided. When the engine revolution speed abnormally increases in the ordinary operation of the engine, and the high revolution state over a set revolution speed is generated, an electromagnetic coil 12 conducts to open the electromagnetic opening/closing valve C. Accordingly, the dense mixed gas is formed by supplying the fuel in a fuel chamber 26 into an intake passage 9 from a passage 11, and the engine combustion state is deteriorated, and the excessive revolution of the engine 31 is prevented.
SUZUKI MASAO
SUZUKI SHIN
