Welcome to JUST ANSWER small engines, let me try to help you !!
Remove the spark plug, and put about a teaspoon of fuel into the spark plug hole, re-install the spark plug. Then if it fires for few seconds, you have carburetor problem.
The needle valve and float can be stuck in the carburetor, not letting fuel to the engine. Here is basic carburetor. Yours will be simiale
Let me know. We can go from here. Thank you.