classic motorcycle forum

Hallo.Ich wanted to introduce myself. My name is Klaudius am 45 years old, I'm in Germany and am interested in English motorcycles from the 20/30 years. Seats 3 Sunbeam from 1932. A 500 and 600 Longstroke and a 600 OHV. All 3 machines are still in the original paint and Fahrbereit.die last was bought here in Cologne in 1932 and is only 16800 km gelaufen.Ich have a question about the valve setting of the Longstroke.Trotz meticulous adjustment to the operating manual is the valve clearance there in warm engine. Otherwise the machine runs absolutely randomly. What am I doing wrong? Please list my Englich, I'm still learning. Thanks a lot. Klauudius