Barossa 250 does not accept gas, false ignition

Good morning together! I have a problem with my Barossa 250, when giving gas low speed rose, then dies off or has strong misignitions. It doesn’t matter how the choke stands, it almost doesn’t improve when operating the choke. Ignition coils are new, candles are new, carburettor is a new one. I really don’t know any more, hope someone can help me. Thanks Greeting Martin