2011 Hesitation on Acceleration

[chacam]

I have a 2011 Yamaha and when I take off from a dead start, it accelerates smoothly with no hesitation. I can push the pedal to the floor and it is smooth and fast. Then if I slow down for a corner or just slow down on a straight stretch, when I try to accelerate, there is a hesitation and then it is able to rev up. I have cleaned the carb in an ultrasound cleaner and it looks in good shape. Short of buying a new carb, is there someplace else I should be looking? It is driving my wife crazy because she thinks it is going to stall. Thanks

[Dflowe]

It sounds like you still have a clog in the carburetor somewhere. When I clean them, I take them all apart and clean all the jets with a wire. Then I put them in the ultrasonic cleaner with Simple Green in it and let it run. Hesitation means a lean mixture and that indicates a clog somewhere to me.

[chacam]

That’s exactly what I did. Removed all of the jets. Cleaned all the jet with a wire. Let the whole thing cook in the ultrasonic cleaner for several hours. Blew it out with air. Just wondering if there is an internal passage that I’ve missed.

[Dflowe]

You might check for an airleak somewhere. The airbox connection is a good place to start. Also, check the carb mounting flange gaskets and be sure you've got a good seal.

[chacam]

Thank you. Will do.

[rstacy]

You may want to replace the needle in the carb. The rubber tip wears out and causes a rich stumbling condition until the excess fuel cleans out.
What color is the spark plug electrode?
Are you finding gas in the crankcase?