Fuel controlling apparatus for internal combustion engine

A fuel controlling apparatus of an internal combustion engine for controlling a quantity of a fuel that is supplied to the engine comprising:

• a fuel injector that injects the fuel to the engine, the fuel injector being controlled on a basis of a throttle opening degree and an engine speed without measuring a quantity of an intake air that is taken through an intake system of the engine;
• a carburetor that supplies the fuel to the engine using a negative pressure produced by the intake system of the engine;
• and
• an overspeed limiting device that stops or suppresses a combustion when the engine speed exceeds an upper limit engine speed;
• wherein, when the engine is operated under a condition that the engine speed is near the upper limit engine speed and the throttle opening degree is above a given value, the fuel is supplied to the engine by both the fuel injector and the carburetor so that the fuel of a necessary quantity is supplied to the engine by combining a quantity of the fuel supplied by the fuel injector and a quantity of the fuel supplied by the carburetor.