Trip to Africa with SXC/ Carburettor

Hello !! As I want to go to Tunisia next Friday with my LC4 (SXC, BJ 2004) I need your help. As long as I run the moped over Choke at the beginning, everything is wonderful. If the choke is inactive, after which the engine has become warm, there are loud flappers and jerks from the exhaust in the sliding mode, in the stationary gas the engine runs very irregularly and goes out. The power is normal, also the gas acceptance. The carburetor (Keihin FCR 41) is clean, valves set, candle and Lufi new. I suspect to have to adjust the mixture. Just like. Thanks in advance.