I took the air filter off of my 7 hp B&S lawn mower about a month ago. It was dirty and prevented starting. I have not replaced it yet but have used the mower for 2 or 3 hours total with no filter. Today the engine sputtered and died and would not restart (still no air filter). Did I already ruin my engine? :frown: Is it too late to clean the carborator and put a new filter on?