Why it started and stopped after a few minutes?

I replaced a lot of things and it still not functioning, new blade, new
spark plug, new air filter, new oil, new gasoline.

This is a Sear's Craftman Self-propelled machine, bout 3-4 years ago. It
was running really well, just dies this week. Lots of smoke coming out,
something is wrong with it. Before I didn't see this much smokes like oil
is not being burn completely.

Thanks for your suggestion.