To get to the gist, a few days ago the lawn mower had ended up on its side for about 10 minutes. I flipped it back over and didn't use it for about two days.
I started it today. At first it had a bunch of white smoke bellowing out, and a tad bit of oil splashes came out of the exhaust pipe. I kept running it until the white smoke stopped. Once the smoke stopped, a few seconds later the engine started knocking.
I immediately stopped the engine, and checked the oil, which was good.
I removed the spark plug cap to pull the cord and see what it sounded like, this is what it sounds like.
Any ideas of what the cause may be?