sputtering low rpms

I just bought it. Its a kickstart and its a custom hard tail. Cleaned carbs cleaned jets finally got it to a good idle changed both spark plugs also. It idles fine now but everytime i go to give it gas it sputters and backfires and such. I cant find a mark of what carbs it has but i think they...

I had some after firing issues. So i chamged and gapped my points and cleaned the carbs. No more after fire. Now my xs idles fine with choke off. But of the start line it starts sputtering until I get up to higher rpms. But if I engage the choke it clears up at the lower rpms, but then dies...