I usually, check the oil, drain the fuel, add in some fresh then pull the air cleaner and give it a short spray of carburetor cleaner (as starting fluid) and try to see if it will run. If it does, and it's running lean, I choke it with my hand to see if it improves. Then you can get a quick idea of the engine (knock, oil burning ETC) condition and go from there. Don't forget to remove the shroud and check for mouse nests. I hope that helps.