Guys, I have a Yamaha FZ-16. Recently, I noticed that my motorcycle is facing a missing problem.

I approached the service centre and they cleaned the carburettor. For 2 days, I didn't have any problem and afterwards, the same problem occurred again. I approached the service centre and they said that I need to change the carburettor. Is it repairable?
And how the exhaust stroke compression comes out by the carburettor side rubber covering?
Please guide me to repair the same.