My suzuki katana some body move the screws in the carburators

Hi,this might help,it is very difficult to get the adjustments right without a set of carb balance gauges,the adjustments are very small and critical to the running of the bike,borrow or buy a set of gauges,hook up the gauges,balance the left two cylinders together so they are both running exactly the same,then do the two right cylinders and get them both running the same,then match the two sets  together using the balance screw between no2 and no3 cylinders,a general rule of thumb to get a startng point is to wind the mixture screws in untill they stop,then back them out about 1.5 turns,do the same to all four screws before you start trying to balance the carbs,make sure the bike is sitting vertical or on the centre stand because if it is not it will effect the balance of the carbs and also make sure you have a good airflow over the front of the motor for cooling as it will take half to three quarter of an hour to get the balance right...most bikes need the carbs rebalanced on a regular basis because when the parts of the carbs start to wear the balance will change,a good set of carb balance gauges is a worthwhile investment...hope this helps