That resulted in that the valves never closed correctly and compression was lost. After fixing that, the engine once again gave signs of life just after a few kicks.
First it didn't want to rev up, so I thought that the carburetor was giving me troubles as it usually does. I tried to move the ignition trig point from around 17° to 30° before TDC (the same as opening the breaker-points on the original system).
The first of the aforementioned points is marked from factory with an “F”, 17° before TDC, and this is where the pre-ignition is supposed to begin when the motor is standing still. Point number two is the one 30° before TDC, also factory marked, but without text. Maybe that one marks when the spark is supposed to come when the engine is spinning fast?
When giving spark at the point 30° before TDC it did rev up again as it hasn't been doing in perhaps ten years.
Today will be spent on doing some minor adjustments and then take a ride in the sun. Next goal is to make the sensor-less concept work, good thing to save for some rainy days.
Perhaps I should put a little disclaimer here. I’m actually mostly a fan of electric motors and bicycles. This problematic dirt-bike however is kind of an old nemesis to me. Now I will count the hours and see if it will work for more than four hours straight, the last record. :)