Lead acid battery is the main resource of motorcycle. It has some disadvantages, look like long charging time, short cycle life and also is not environment friendly. Supercapacitor is an electronic tool which can conserve electric current. It has higher power density compared to lead acid battery, but lower energy density. It is also faster in terms of charging, environment friendly, and has longer life cycle than lead acid battery. In this article, supercapacitor is used to substitute battery. The model is able to charge, discharge, and support engine starter in motorcycle. The result of this research shows that supercapacitor is able to substitute battery in motorcycle.