Yamaha FZ-S engine missing problem

I Have a Yamaha FZ-S version 1 bike. Recently, (probably three weeks ago) I have a got engine missing problem with it. So if I would say how it was occurred that, when I started the engine, it is running normally but sometimes I have to trigger the self-start button more than three times to startup the engine. However, after the engine start, it is running normally, but when i apply the gas(Accelerator), the engine starts to missing and unable to increase the engine RPM and stop. What can i do?

Note :-

1. I had done a full service just before tow mounth
2. After this incident, I visited Yamaha Delear for Carburetor cleaning. but the problem is still occuring.