Well!
Good analysis!

but a special motor in China was rare known by people.
yes,that's CJ750 sidecar.
Cj750 is the first motor which used by Chinese military. In China, military used means high quality.
He is the oldest motor in China over half of a century!
So if you love old and high quality "China bike", CJ750 don't let you down!
For some reason, CJ750 was loved by west country, and was known by "Black Star"
Many people visited China bought one to their country.
Anyway.....Hope you all find a good bike!