Aprilia DiTech

http://www.speed-sports.com/motorscooters/scooter_models/aprilia_scooters/ditech.html

Direct Injection Technology engine is able to reduce fuel consumption by up to 50% for two-cycle 50cc scooters and reduces pollutant emissions by 80% without a catalytic converter, without compromising simplicity, reliability and power. Technology developed by Orbital.