本国际标准规定了用于评估ISO 3833中定义的轻便摩托车发动机性能的方法，尤其是为了呈现功率曲线和满载时作为发动机转速函数的燃油消耗率，以进行净功率评估。它适用于往复式内燃机（火花点火），不包括自由活塞发动机和旋转活塞发动机，自然吸气或增压，并配备机械增压器或涡轮增压器。

This International Standard specifies methods for evaluating the performance of engines designed for mopeds as defined in ISO 3833, in particular with a view to the presentation of power curves and specific fuel consumption at full load as a function of engine speed, for net power assessment. It is applicable to reciprocating internal combustion engines (spark-ignition), excluding free-piston engines, and rotary piston engines, either naturally aspirated or pressure-charged and equipped with either mechanical pressure-charger or turbocharger.