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With the increasing requirements of environmental conservation in recent years, reduced exhaust emissions and increased fuel-efficiency are in high demand for smaller size motorcycles popular in the Asian region. In order to meet such demand, the optimum design of the fuel supply system is the most effective method. In the carburetor, the core component of the fuel supply system used on a majority of current models, a 25% improvement in the accuracy of air-fuel ratio fluctuation, as well as a 15% reduction in size, have been achieved in comparison with past models. On the other hand, in fuel injection systems, the use of which is gradually expanding, it is essential that the components be highly functional with high performance, while at the same time being of a compact size. In regards to the injector, optimum spray form and a 30% reduction in size have been realized by utilizing injection simulation techniques.