Motor won’t start after hitting stump

Assuming you mean that the starter turns the engine but it doesn't fire, check all the settings to be sure you didn't accidentally bump a switch or lever. Then as others have said, pull the flywheel and inspect the key. If that isn't it check with some gas in the carb throat to see if it runs. The impact could have dislodged some debris in the fuel tank. Start with the flywheel.

It takes 3 things for an ICE to run

Air and Fuel in the right appx ratio
Spark at the right time
Compression

One of them is missing. Your job is to figure out which.
 
Another way to check the flywheel/key.

Pull plug and pull off the engine shroud so you can see the flywheel and coil. Turn over the engine the correct direction and position the flywheel magnet just after the coil pickup. That is the time that the coils primary is collapsed and the secondary will create the "spark". The piston should be at/near top dead center. If not then timing is off and you prolly have a sheared key.
 
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