All attempts to adjust the carburetor are pointless if the inside is dirty and the seals or suction rubbers are defective. The trains must also run smoothly. Carburetors cannot be synchronized by connecting the vacuum connection. 1. Adjust the ignition when the engine is warm 2. Adjust the valves when the engine is cold.
The carburetor idling is often complained about. Before opening the carburettors, the cables should be unhooked from the throttle grip and well oiled. The cables are often unfavorably laid and kinked directly above the carburettors. The wire rope in the sheath must then be moved over this kink. The remedy for this is the kink protection / fine tuning.
