Interuption on the low rpm
 

Hello guys,

Last year i bought a Yamaha FZ6 (2005) 600cc. On my first ride appeared the following issue which I will try to describe with maximum details:
1. When the engine was cold everything worked perfectly.
2. When the optimal temperature was reached the engine stops working every time I touch throttle.
3. I spoke with my friend who refer me a service specialist. This guy told me that the issue came from the automatic choke. As per him the issue was that choke was blocked/contaminated.
4. He had cleaned it seems that the issue was gone…until this year 
On my first ride this year the same (or almost the same) issue appeared again. When I touch the throttle the engine starts fading (only on the low rpm). There is no issue when the engine works over 3000rpm.
So I am wondering if someone has/had the same issue and if so how it should be resolved.
Amy information will be much appreciated.

Simeon