So I have an old Briggs and Stratton (Model #:11P9-02-2693-B1) That I used for mowing lawns in my neighborhood. So, I'm mowing, right? And the lawnmower is Kinda pulsating with the up and down speed. So I'm not really concerned, because my other lawnmower did this, too, and I just cleaned the Carb and it was fine. But anyway, the lawnmower sped up really fast, and died. A bit of smoke, just a little hazy cloud, nothing big, came from the air filter, and the lawnmower died. Wont start. Not even the slightest cough. So I go home, and Clean the carb, Try to get it to work, and it does nothing. Gave it starter fluid, pulled again, wont budge. There was new gas and old oil, because my neighbor gave it to be if I fixed it. At the time, I didn't know how to change oil, so I just ran it with old oil, not knowing if it would damage the engine. The mower was sitting in my neighbor's shed for a couple years and the gas in the carb was bad, and I had cleaned that before I used it. But now, I drained the oil, when I figured out how too, and put new oil in, and it still wont work. Like I said, the engine wont sputter, cough, spit smoke, nothing. I checked the spark plug by shocking my little brother (Accidentally) but it still works. I even got a new one, But it still does nothing. PLEASE HELP! I need this mower It is the nicest one that I have.