Chain saw will not run above vacant?
Answers: Fresh Fuel? Air filter clean? Fuel filter/strainer surrounded by fuel tank clogged? Carb diaphragm unpromising? Or mixture screws necessitate adjustment. Depending on the brand, sometimes a bad crank stamp or engine seal let all the compression escape out.
Try the main mixture screw..it may enjoy a small particle trailing it. Carefully screw it out..blow some air thru it, & replace cautiously. turn in beside your fingers & back it out 3/4 turn, next more if necessary..