I could use.some carb setting help.as well. The big screw on the carb you tweak by hand needs to be turned all the way in for it to idol. What is the other little screw below this one that you need a little flat head to turn and what should that be set and when should it be tweaked? Also my needle is set at the middle.slot which I belive is the third notch down. When should this be changed and what does going up or down change?