It's odd that it just ran fine not long ago.
Checking the valves is a good idea, though unusual, it's possible a rocker popped off or there's something unusual going on under the cover...
If all that checks out, a couple last-ditch effort things to try would be Starting Fluid (Gordon doesn't like it because it's bad for any plastic in the carb. Maybe lift the slides and open the throttle plates before giving it a shot). If it sputters at all, it tells you there is a fuel/carb related issue.
The other thing would be trying to bump-start it.
Oil level is good? No chance of fuel draining into the crankcase?
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