In order to check the basic registration, it is best to get some photos and a good scan of the vehicle papers in advance.
Over the years, there are some hurdles:
All vehicles younger than 1962 and over 125 ccm need turn signals - without if and when. Vehicles with 1961 and older no matter what displacement need no turn signals. Also, handlebar indicator lights are correct, provided they have a neat luminance to the front and rear.
Various exhaust gas standards have existed in recent years. Important is the year 1989. Everything with year of construction until 31.12.1988 does not need an exhaust gas examination = ASU. So here we are on the good side with the performance increase. Vehicles with 1989 and younger, strictly speaking, require proof that the exhaust gas values do not deteriorate during driving. With driving operation is actually meant not the normal ASU, in the standing gas, a measuring bowl is held in the exhaust and sometimes gas is given. Instead, we are talking about a measurement of the exhaust gases in the actual driving operation - gladly also on a simulation test stand with a dynamic roller brake, .... Makeable ! But the cost factor is roughly 2000 - 4000 €. And the probability of existence is rather low.