Thank you. In the meantime I'm not sure about this thread. Probably too long and too complicated in some parts.
Finally I had to do some changes on the little video.
It shows how I balanced and how I measured the results of the truing. It is about 4:15 minutes.
Working on this thread, I got some clarity about relationships. For me, there are some conclusions:
1. The lifetime of the bearings
The limiting factors are the max dynamic load on one side and the fatigue load limits on the other.
Barings which are loaded maximal quit their lives (statistically) after 1 Mio revs, which are 70 miles.
2. Balanced engines compensate forces internely.
Balanced motors compensate internal forces, although they are still there. They just can't reach the outside. This generally doesn't generate additional power.
3. Trued crankshafts generate more useable energy than not trued ones.
Vibratory plates also need a separate drive.
4. What is the role of the gases. I wrote pretty much none at all.
Anyone can check this by opening the gas at a certain speed and closes. Changes?
5. A bicycle should not vibrate stronger while driving at any speed than with the clutch pulled on the stand.
Otherwise, the vibrations coming from somewhere else. Mostly of the drive, chain, sprockets.