A motorcycle including a propelling group or engine, a saddle support, a support for the rear wheel and a front directional group including a handlebar integral to a steering headstock functionally associated to a supporting organ of the vehicle front wheel. The front group is connected to a box-like body incorporating the function of filtering box, constrained to the engine and apt to support the latter by connecting it, therethrough, to the front directional group. The support for the rear wheel and the saddle support being constrained to the engine. The vehicle not equipped with additional members apt to constrain the engine to the front directional group.