Honda GW160 gas engin runs for 30 seconds and stops.

My fairly new Honda GW160 engin starts and runs OK for around 30 seconds and than stalls. To restart it I have to put the choke full on. I can run it roughly with the choke. When I try to accelerate its stalls and I have to wait a few minutes to restart it. I have cleaned the carburator and gas tank and the problem is not solved. It seems to be a fuel supply problem but maybe something else??