Engine won't start after it sits for awhile

I have a Toro Recycler 22" push mower with a Briggs & Stratton engine, model# 202332. I it runs fine after mowing a while, but after I cut it off and leave it sitting for about 15 minutes, I try to crank it but it won't start.

That is for maybe 5 minutes after I try to crank it, then after cranking, it continues to run perfectly well. It won't have any trouble cranking if I have to stop it for a minute while I empty my bagger, just only when I take breaks (about 15 minutes).

It had plenty of gas, spark plug's in good shape, and air filter's clean.

What's wrong with it? If anybody has a solution, I would appreciate your input.

 

This has the autochoke, right? (No primer). If so, it's a poor design and this is a problem associated with it. Try this: Next time it won't start, tilt the entire mower a bit with the carburetor up in the air, only for a few seconds. This allows some gas to dribble through the nozzle into the intake. Then it should start.

When the engine is hot, the thermostatic control holds the choke open, so it can't get the rich mixture sometimes needed to restart.

 

By the way, it has the autochoke (No primer).

 

Thank you 'cheese', I'll try this next time I use my mower.