Abstract: In a motorcycle ignition system where an internal combustion engine includes front and rear cylinders; a circuit breaker comprising superimposed point plates in which a pair of point assemblies are individually adjusted with respect to at least a single control cam; an offset arrangement of the rubbing block or follower on a pivotal point element with respect to the axis of rotation of the operating cam to afford quicker opening and closing of the points; and a plurality of ignition circuits for multiple cylinder engines in which one or a pair of coils are used; one of the point plates and its respective point assembly being usable in a conventional single point, twin tower arrangement.