Fuel related

I have a Hyosung gt125 and takes the piss to warm up, after about 10-15 mins with choke on full, Wack choke off and try to ride and sounds like the bike is starving fuel, after a couple of pumps from the throttle it slowly comes through, could this potentially need upjetting or carb settings looking at….. it kicks in about 8k onwards and before that is slowly accelerates with the exaust making a crackling sound. Need help with fixing this as it’s doing my head in!!!