The research determined the degree of firing at Honda C100 by the CDI programmable and the engine power analyzed. The degree of firing was obtained from higest power at the each rotating engine, so it was used to determine the new degree of firing. The test new degree of firing results that the degree of firing before 10o BTDC did not produced the good performance and the power increased at the acceleration of engine increased. The highest power was obtained at 7250 rpm in gear step 3.