4-cylinder, in line, 4-troke, water-cooled, single overhead camshaft (SOHC), electronic-fuel injection. It adopts multi-point sequence electronic controlled injection system, and combined with three-way catalytic converter. It is noted for its small displacement, high power per liter, low fuel consumption, minimum contamination, compact structure, light weight, small size and easy maintenance. Be applicable to motorcycle with three wheels, double cab mini truck and various mini vehicles.