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The new European legislation on two-wheeler pollutant emissions has forced two stroke engine manufacturers to study the direct fuel injection (DI) technology. The Piaggio “ET2 Injection” was the first DI engine in production, using the FAST system (Fully Atomized Stratified Turbulence) applied on a 50 cm3 engine. Within the framework of the DOLCE project (Development Of innovative Low pollutant, noise and fuel Consumption two stroke spark ignition Engines for future vehicles for individual urban mobility) coordinated by Piaggio and supported by the European Commission, a 125 cm3 direct injection 2-stroke engine was developed. This paper presents the engine-related part of this work, which was concluded in March 2000. The engine is equipped with the FAST system and the fuel metering is performed by means of a low-pressure electronic fuel injection system integrated in an Engine Management System (EMS) specially developed for this type of application.