Air, fuel, ignition, and compression, in the right amounts, at the right time. That is all that required for an engine to start and then run.

I'd try gas instead of carb cleaner. Fill the fuel bowls, pump the pedal, fire it up. It is starts, it will run until the bowl is sucked dry, which may be about a minute or less. If that happens, then clean the tank and fuel line and hook it up so it will pump fuel.