Did the saw sit for this time with gas in it? If so, the gas in the carb has probably turned to shellac. Take the top cover off, remove the air filter, open the carb butterfly and spray some carb cleaner in it. Wait 24 hours and try to get it to fire. While you're waiting, check the plug for fouling. If it still won't fire, give it a small shot of starter fluid.
Answers & Comments
Did the saw sit for this time with gas in it? If so, the gas in the carb has probably turned to shellac. Take the top cover off, remove the air filter, open the carb butterfly and spray some carb cleaner in it. Wait 24 hours and try to get it to fire. While you're waiting, check the plug for fouling. If it still won't fire, give it a small shot of starter fluid.