Help! Briggs and Stratton Generator engineâ€¦ Has clean carburetor. Has compression and spark. Is full of oil. Flywheel key is intact. All old gas was removed (ALL). New, treated gas put in Valves appear to be intact. Rockers are in place. Nothing looks bent. If you pull on the rope enough (after spraying a small amount of carb cleaner into engine) it belches fire from carb.