Please help me! - Vespa 50 Special V5B3T loses power after 50 meters because of hitting a speedbump too hard

After i hit a speedbump my engine quitted on me. 

I can only start it with full choke but after 50 meters it loses power and stops again.

What could have happened?

I suspect there is wrong air in carburetor. Maybe need to clean it.

Maybe a thing in carburetor