25-07-2020, 05:57 PM
Ah, that's a magneto ignition. I remember those. Also the headlight that went orange and flickered when you stopped. I may have had two or 3 Italian scooters in 1970s and also set the timing on a magneto ignition go-kart for a friend. Sadly it had no location mechanism for the flywheel and the flywheel would slowly drift on the shaft.
I've no idea if that will work. Any transistor ignition I remember (as projects and retrofits to cars in 1970s and 1980) used a battery, the transistor charged a capacitor and something discharged it. The Magneto ignition has the current build up in the coil and then the points opening will interrupt it and for an inductor voltage is proportional to L x ΔV/ΔI, since I changes from something to nothing in a very short time, the voltage is high. The ignition coil may be a Tesla type transformer, so the voltage is magnified. A transistor would have to cope with a huge voltage, which is why CDI based transistor circuits work differently.
I've no idea if that will work. Any transistor ignition I remember (as projects and retrofits to cars in 1970s and 1980) used a battery, the transistor charged a capacitor and something discharged it. The Magneto ignition has the current build up in the coil and then the points opening will interrupt it and for an inductor voltage is proportional to L x ΔV/ΔI, since I changes from something to nothing in a very short time, the voltage is high. The ignition coil may be a Tesla type transformer, so the voltage is magnified. A transistor would have to cope with a huge voltage, which is why CDI based transistor circuits work differently.
