Specifies a method for testing engines as defined in ISO 3833:1977. Applies to the evaluation of their performance with a view, in particular, to presenting curves of power and specific fuel consumption at full load as a function of engine rotational speed. Concerns internal combustion engines used for propulsion of motorcycles and included in one of the following categories: reciprocating internal combustion engines (spark-ignition) but excluding free piston engines, or rotary piston engines.