Dimitrios, You are a star, well found. Some good info there. I'll have a read through that lot when I get some time later. May need the German page translating.
Starter for 10, the capacitor C1 gets charged from the LT coil via the green terminal and then discharges the stored current when triggered by the pickup via terminal 2 switching on the thysitor Th1. That sends a big fat pulse to the HT coil and ZAP...no idea what the other bits are there for