Vehicle comprising a two-stroke internal combustion engine and an electric motor, wherein the internal combustion engine comprises: - an empty cylinder - a head that closes said empty cylinder on top; - one or more outlet ports in communication with the interior of said cylinder to discharge gases from said cylinder, - a valve suitable for intercepting a gas flow that passes through said outlet port, - an inlet port in communication with the interior of said cylinder to introduce air inside said cylinder, - a crankshaft; - a piston mounted on said crankshaft, in such a way to alternately slide inside said cylinder between a first position, wherein the piston closes the inlet port and the outlet port, and a second position, wherein the inlet port and the outlet port are open, - an injector suitable for injecting a fluidized fuel in the cylinder, - a compressor suitable for injecting compressed air in the cylinder through the inlet port; and - an actuator configured in such a way to actuate the exhaust valve in order to block the gas flow from the cylinder through the outlet port when the piston is moved from the second position to the first position, and in order to exhaust gases from the cylinder through the outlet port, when the piston is moved from the first position to the second position; characterized in that said internal combustion engine also comprises a gear system provided with a primary shaft coupled with the crankshaft and a secondary shaft selectively coupled with the primary shaft, and wherein a first pinion and a second pinion are keyed on the secondary shaft, the first pinion being coupled by means of a first transmission element to a toothed wheel that is integrally fixed with a driving wheel of the vehicle, and the second pinion being coupled to a drive shaft of the electric motor by means of a second transmission element. wherein the internal combustion engine comprises: - an empty cylinder - a head that closes said empty cylinder on top; - one or more outlet ports in communication with the interior of said cylinder to discharge gases from said cylinder, - a valve suitable for intercepting a gas flow that passes through said outlet port, - an inlet port in communication with the interior of said cylinder to introduce air inside said cylinder, - a crankshaft; - a piston mounted on said crankshaft, in such a way to alternately slide inside said cylinder between a first position, wherein the piston closes the inlet port and the outlet port, and a second position, wherein the inlet port and the outlet port are open, - an injector suitable for injecting a fluidized fuel in the cylinder, - a compressor suitable for injecting compressed air in the cylinder through the inlet port; and - an actuator configured in such a way to actuate the exhaust valve in order to block the gas flow from the cylinder through the outlet port when the piston is moved from the second position to the first position, and in order to exhaust gases from the cylinder through the outlet port, when the piston is moved from the first position to the second position; - an empty cylinder - a head that closes said empty cylinder on top; - one or more outlet ports in communication with the interior of said cylinder to discharge gases from said cylinder, - a valve suitable for intercepting a gas flow that passes through said outlet port, - an inlet port in communication with the interior of said cylinder to introduce air inside said cylinder, - a crankshaft; - a piston mounted on said crankshaft, in such a way to alternately slide inside said cylinder between a first position, wherein the piston closes the inlet port and the outlet port, and a second position, wherein the inlet port and the outlet port are open, - an injector suitable for injecting a fluidized fuel in the cylinder, - a compressor suitable for injecting compressed air in the cylinder through the inlet port; and - an actuator configured in such a way to actuate the exhaust valve in order to block the gas flow from the cylinder through the outlet port when the piston is moved from the second position to the first position, and in order to exhaust gases from the cylinder through the outlet port, when the piston is moved from the first position to the second position; characterized in that said internal combustion engine also comprises a gear system provided with a primary shaft coupled with the crankshaft and a secondary shaft selectively coupled with the primary shaft, and wherein a first pinion and a second pinion are keyed on the secondary shaft, the first pinion being coupled by means of a first transmission element to a toothed wheel that is integrally fixed with a driving wheel of the vehicle, and the second pinion being coupled to a drive shaft of the electric motor by means of a second transmission element.