Did you remove the spark plug and spray cylinder with carburetor cleaner and purge the cylinder to get any old gas and oil residue washed from the cylinder? If engine is still hard to turn, look at the clutch release clamp and spring, it may be dragging ,causing saw to be hard to pull.
I like the Berryman brand of spray carbuetor cleaners, sold at most any auto or retail supply . And no , the gas fuel mix will not melt the deposits like the carburetor cleaner will. Looks ie we may have a big time difference, I'm in Texas, an it is 7:00AM. I will not call at this hour!