In this paper, the implementation of a capacitive discharge ignition (CDI) for dual-cylinder motorcycles is presented. The structure of the proposed CDI mainly includes one microcontroller, one flyback converter, two capacitive-discharge circuits, and two over-voltage protection circuits. The proposed CDI mainly uses Hall sensors to sense the optimal signal of the ignition time. Therefore, the optimal ignition angle of the spark plugs can be obtained. In comparison with a traditional contact magnetic ignition, the proposed CDI can obtain more exact ignition timing of the spark plugs and reduce hydrocarbons (HC) and carbon monoxide (CO) in the exhausts of motorcycles. Therefore, air pollution is reduced and the environmental quality can be significantly improved. Finally, to verify the performance of the proposed CDI for dual-cylinder motorcycles, a prototype hardware circuit was built and implemented. From the experimental results, the feasibility of the proposed CDI has been verified.