A method for regulating the power delivered by a reciprocating engine includes the definition of the value of a constant time interval T1 and the values of a threshold for the engine rpm and of a threshold for the percentage opening of the engine throttle valve, below which an operating area is defined in the Cartesian graph xy whose axes represent the engine rpm and the percentage opening of the throttle valve TPS. The method also includes: measuring, for each engine cycle, the value of the engine RPM at the level of an angular position of the crankshaft in a specific stroke (IS, PS); calculating, at the final instant (A) of each time interval T1, an activation value X* obtained from a comparison between the last RPM value measured before the final instant (A) and the last RPM value measured before the initial instant (B) of the time interval T1.
