This generator-port driven magneto is great for Alternator/Generator style Big Twin engines. Can also be used on 1936 thru 1969 generator style Big Twin engines that are used for racing or other applications that do not use a charging system. Features fully automatic impulse coupling for incredible starting, no matter if it is kick start or electric start. This magneto is easy to bolt on and can be mounted in various positions. Dependent on the used crankcase and chosen position it might be necessary to remove some case material.