I just got the carb rebuilt, oil changed and sparkplug 4 months ago. Now I don't have any spark now, put new plug in and nothing. The mower sound like it almost wants to start but nothing.
Dump out all of the old fuel, it is likely the problem. Put in fresh fuel and get back to us.
I am assuming that the last time it ran was 4 months ago, if not, give us all of the details about the problem, ie., the last time it ran, etc.....