Resumen
It is shown, for the most challenging case of a cruiser motorcycle of low weight-specific and displacement-specific power and torque, that the tuning for better top end performances is irrelevant for the operation over the driving schedule used for certification. During the certification test, the engine only operates in the low speeds and loads portion of the map. It is concluded that any statement about motorcycles? pollution and fuel consumption should be only based on the measurement of their regulated emissions through proper chassis dynamometer tests, possibly redefining the driving schedule to better represent real driving conditions.