Going to have to do a little more testing.
Could be:
Plugged; carb, fuel line, tank fitting, filter
Stuck valve
Bad condenser
Bad coil
Blown head gasket
Plugged exhaust
I'd start by taking the carb bowl off and seeing if it has dirt/crap in it. More than likely a fuel problem. If there is no gas in the bowl, work your way back to the tank. If it is full, and everything looks good. Go to checking the ignition.
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