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This paper studies the dynamic model and associated control methods of a single cylinder four-stroke internal combustion (IC) engine attached with a variable intake-valve actuation mechanism. First, pertinent data of intake and exhaust ports, valve-timing cam, output torque, frictional torque, and crankshaft dynamics obtained from a 125 cc IC engine constitute the dynamic model for further control of the engine performance. Then, calculated data from specific conditions confined by volumetric efficiency and specific fuel consumption generate control commands for intake-valve actuation for various loads governed by a genetic algorithm. For quest of the best fuel economy, MatLab/Simulink programs simulate and evaluate the effective efficacy of the proposed control system under ECE-R40 driving cycle.