Disconnect the fuel line from the carb inlet, slide the nut up the pipe a bit, disconnect the + wire from the coil and tape it up, put a piece of fuel line on the end of the steel line and into a fuel-safe container. While observing and holding the fuel container, with a fire extinguisher close at hand, crank the engine and see if a reasonable volume of bubble-free fuel flows into the container.

If not, check fuel pump and eccentric and lines. If so, check carburetor. Do you have any spare parts on hand?