I recently acquired an old tiller that I have gotten to run. It will only run on full choke. It will only till for about a minute or so before going dead. It will idle for a long period, but it's kind of a rough idle. Do I need to adjust the carberator? I have already changed out the gas and sprayed carb cleaner in the carb. I have let it idle for over an hour all together so it should be cleaned out fairly well. When I ease it off full choke it starts sputtering and goes dead. I put it back on full choke and one pull it fires right back up. I've let it idle for 30 minutes straight and it still has to be on choke.

Any suggestions??

Thanks,
Jim Bob