Honda MBX 50 Weak spark

Hello, I have a few problems with my MBX and hope for tips because I am finished with my Latin. And I bought myself for the winter over a Honda MBX 50, has a 70 he set on it, but that does not matter now. The problem is that I ran out of it 4 weeks ago. But she let herself click again. A few days later the same game was now kicking but no solution but I had to push it several times to run again. In addition, I have to i always keep it on the gas, since it did not hold any stationary gas. However, I wanted to drive again for a few days and it went out with a misignition on full drive and since that can be neither kicking nor pushing. Carburettors and membranes are cleaned and spark plug gets moist. The ignition spark is there, however not really strong. Already changed (so new) or checked (measured) is: spark plug Ignition coil (with cable and plug) impulse generator (at the base plate) te) Ignition unit (on the base plate) All cables tested for passage, to exclude cable breakage If I connect the ignition coil (old and new; according to measured values both functional) externally to a battery in order to get an ignition spark without ignition plug, it falls out very small up to almost no spark. Does the CDI serve as amplifier for the ignition coil? Currently I am really in despair and have slowly demanded that the thing to throw away. Hope on helpful tips, many da I don’t think so.