Finally got tyres, rollers....etc. , to put them together again.
This german dealer could not deliver METZELER TE 7, so I had to take City Grips also for the blue one.
Changed to MALOSSI CVT with Dr. P's 14 grams. The blue one had a partially clogged injector, which was cleaned by taking out, put it on a battery and backflushed with an injector cleaner, as described in one thread, thanks for that.
Did the same at the red one too,...
Both are shipshape now, let's see what comes next.