A power plant comprising a fuel-burning engine, a main gearbox, and a drive train. The power plant includes two connection bars extending respectively along a first direction and a second direction, which directions are not parallel and intersect a common pivot axis, each connection bar being hinged by a ball joint to the main gearbox and to the engine in order to eliminate relative movements along the longitudinal direction between the main gearbox and the engine, and in order to allow limited pivoting of the main gearbox and of the engine relative to the axis.