On Wed, 21 Jun 2017 12:54:47 -0700 (PDT), "Terry S."
wrote:

I left my lawnmower out in a thunderstorm two days ago and now it won't start. It's a Craftsman "Self Propelled" push model with a Honda engine. Any ideas on how I could get it running again?

Buy a spray can of starting fluid ($4.00), remove the air filter, open
the choke, spray a quick spritz of the above into the carburetor,
reapply the choke and give it a pull.

Being left out in the rain, two days ago, shouldn't cause the problem
you are experiencing, unless the rain storm was bordering on a flood.

While it is off, check the air filter and make sure it is dry.