CDI Single Cylinder Programmable Battery Powered Ignition. PC Programmable, high output ignition. Create a timing curve with up to 20 points across the engire rpm range. Switch between two timing curves on the fly. Accepts magnet pickup or Hall- Effect trigger inputs. Program a rev limit for the launch and one for overrev applications. Single Cylinder Programmable Battery Powered Ignition CDI(PN 4217)