I have tried to thoroughly clean a carb and have failed more than once. You have my sympathy if this is the problem.
lets see.. You know you have fuel flow up to the end of the fuel line. Beyond that point, you cannot be sure.
There's a way to see if fuel is actually entering the float bowl without dropping the #@&^*! engine again and removing the carb. Remove the right side cover, turn the pedals to just the right point and stick a flat screwdriver straight through a hole in the sprocket, and through a little hole in the frame.
At the bottom of the carb's float bowl is a drain screw. (Use a flashlight to see where it is) Back that screw out a couple turns and fuel should flow out of the rubber drain hose and onto the floor.
Find the end of that drain hose and put it in a tin can and drain several ounces. If fuel continues to come out of that drain, you can be sure the carb is getting fuel through the float needle and it's seat. Tighten that drain screw.
If you have flow to the bowl and no fuel leaks, the moving parts of the carburetor were cleaned and assembled properly and are functioning.
Do that little exercise and come back here with the results.