Engine not getting gas.

If the fuel is getting past the fuel filter the issue could be a stuck needle valve in the carburetor. If the carburetor has a drain button on the bottom of the float bowl push it to ensure fuel flows freely for several seconds, if there is no drain plug or button pinch shut and disconnect the fuel line from the inlet to the carburetor, direct the line into a clean container and remove the pinch clamp, if fuel flows freely the filter is not clogged, if the fuel does not flow well replace the fuel filter.
To unstick a needle valve use a short blast of low pressure air (5-7 psi) into the carburetor fuel inlet, if the needle valve is stuck the air will tend to all blow back, once the valve opens you will here a change in tone. If you do not have access to adjustable compressed air try tapping the side of the carburetor gently, if it remains stuck you will have to remove the float bowl to gain access to the float and needle valve.