might be jet issue or petrol setting. Maybe your car doesnt have a suitable jet installed.
how can a jet place wrongly? while the overhaul process did you get carby serviced or anything?
Does it give any smoke at cold start or pushing pedal hard ? if its the vibration sound of engine? you need to get check your engine mounts. or the sound is coming inside the engine? like tak tak tak and increases when pedal is pushed harder?
Whats the petrol average now ? Which city you are from bro ?