Thank you, people, I am very glad and happy to see your words, and your forum overall - it is interesting, to know, that such motorized bicycles are built also in US and Canada, Australia!
English is my third foreign language... Hope, I am better, than Google Translate
One of aspects, good for restoration of Russian machinery - that time (50-60-70-ties) a lot of products were standardized in planned economy. For example - very-very similar lenses were used not only on bicycles, but also on different agrimotors, cranes, tractors, and even military machines, just painted green there.