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In this paper, the results and main conclusions of a R&D project carried out to achieve the highest level of performance in a 125cc. 2-S engine for a World Championship racing motorcycle are presented and discussed. Both computational (Modelling Techniques) and experimental (steady flow rig and motorcycle roller test bench) means have been combined, trying to accomplish the highest degree of optimization. An important improvement in the engine's performance was obtained as a result. The paper also describes in some detail the organization of the study, the possible strategy of optimization, the characteristics of the new computer code used to perform the calculations of these very difficult engines, and the experimental measurements. With the objective being to achieve the highest level of performance in a 125 cc. 2-Stroke engine for a World Championship racing motorcycle, a wide R&D project has been carried out by the use of experimental and computational techniques.