Magnetic ignition system

A circuit to achieve large ignition advance, limitation of speed of revolutions and to prevent backfiring and reverse direction running in a magnetic ignition system comprising a flywheel and a two-legged iron core, on the first leg of which in the direction of rotation of the flywheel are arranged an ignition transformer (L3/L4), a charging coil (L1) in order to generate a charging pulse to a charging circuit and a triggering coil (L2) that generates a triggering pulse before and a triggering pulse after the charging pulse to a main switch (T1),

• characterised in that a time-constant circuit that controls a control switch (T2) which opens/blocks the triggering pulse is connected between the charging circuit and the main switch (T1), which time-constant circuit and control switch (T2) are arranged such that the charging pulse blocks the second triggering pulse such that triggering takes place on the first triggering pulse of the next revolution in order to achieve ignition advance, whereby limitation of the speed of revolutions occurs by means of adjustment of the time-constant circuit and that reverse direction running is prevented in that the charging pulse is arranged to block the subsequent triggering pulse via the time-constant circuit and the control switch (T2).