Abstract: A fuel injection system for a multiple cylinder two-stroke cycle engine having a plurality of cylinders provided with intake manifolds, respectively, comprises a plurality of fuel injectors each operatively connected to its respective intake manifold, a controlling unit operatively connected to the fuel injectors for controlling fuel injection of the fuel injectors, and a unit operatively connected to the fuel injection controlling unit for detecting the revolution number or speed of the engine. The fuel injection controlling unit includes a micro computer for carrying out calculations in response to information from the engine revolution operation detecting unit so as to inject the fuel a plurality of times with equal angular intervals defined therebetween during one revolution of the engine, or the crank shaft, during the neutral and low revolution periods of the engine.