I was on holidays for more than four weeks and a total of about 7.300km to and in Norway. My spouse on a Y1 (LTD, 1982) and me on a K1 (LTD, 1983). My uncle was with us on a Y2 (LTD, 1983).
All three LTDs are very close to stock setup and had the same issues.
With the fully warmed engine the idle speed (Leerlaufdrehzahl) where at around 1.800 rpm. All of them started without any issue when they were cold.
Have a lot of experience with Z750Twins, but no real idea how to cure that.
Just live with that, it was the most reliable setup that we could gain 😉