Abstract: The disclosure describes a carburetion system for an internal combustion motor which operates with a mixture of vapor fuel and air. The system comprises: a carburetor which is characterized by operating as a continuous injection system, and a removeable heat exchanger which is incorporated into the admission system before the exhaust system, in order to heat the admission system. The carburetor is supplied under constant pressure through a pressure regulator which enables to vary the pressure of the fuel depending on the operating conditions and the behavior of the motor in general; moreover, the carburetor is provided with automatic control means to regulate the proportion of the quantities of air which accompany the formation of vapor fuel and the heat exchanger; finally, this system enables to limit the premature expansion of the combustible mixture which is introduced into the combustion chambers.