I have an older 12 HP Sears Riding Mower. It starts without a problem
when its cold. But after its been used for a while, stopped, and
restarted, it will not start. If I leave it overnight, it will start.
I made sure the air filter is clean (or close to it) and that's not
the problem.

Any help would be greatly appreciated!

Thanks,
C. Doxey