Carb issue

i put a new carb kit in my 85 trx250 fourtrax. the reason was because it was running really rough when i rev'd it and it had been sitting for years. That seemed to take care of that problem. Now though, even though it idles really nice, if i give it just the slightest amount of throttle and hold it there, it will start to sputter and miss and sometimes shut off. Do i have the air/fuel screw too rich on fuel possibly?

thanks