should be for a straight blade screwdriver,also there is a screw for the throttle stop,that is only for idle rpm

the high speed mix screw needs to be adjusted,there are 2 screws the one closest to the intake and the piston is the low speed,tune that for good idle and transition when first hitting the throttle,then under load cutting a hole adjust the high speed screw,may take 2 people to do,but thats were i would start if everything else seems good