Repair guides and support for gas, electric, and human powered machines used to cut grass, whether push style, or ride-on.

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Lawnmower shut itself off while running. Does not start.

After a long run, noticed a white smoke coming from the muffler and then the engine stopped. I let it cool down, checked the oil, and replaced the sparkplug. None of these helped.

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Can you give a description of what exactly it does when you try to start it? Does it do nothing? Does it attempt to start and then cut out?

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Try a compression check. It sounds to me like you blew a head gasket or maybe even the head.

But look here too.

-OR-

The case could be over filled with oil.

The rings could be worn depending on the age/hours.

White Smoke not good, sorry.

Frank

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