Setup turned out to be real nightmare, sometimes it start sometimes not, very intermittent.
Especially with a warm engine, starting was very troublesome. A fresh plug mostly did the trick, but afterwards the 'old' plug functioned again allright. Also noticeable was that with a cold engine when the lights were switched on that the engine stalls. This scooter still uses the original Filso 4-pole ignition.

Everything was double checked and replaced when in doubt. The points, condensor HT lead, sparkplug cap. Zfter a long period of truing finally a new HT-coil gave better results.