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Hey all, I just got a used 2020 390 Duke a few days ago...now I have to face the Covid19 messed up NJDVM to register it! Rode it once (on a private closed road of course), and absolutely love it. I have a Grom also...very glad to be here!
 

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I got a 2019 390 in July.
Great bike. It rips below 120km
The lurching below 4000 was disturbing though. I got a Powertronic which made bike into a race track worthy bike, however lurching was still there. I added a bung and an AME wide band gauge.
I then added 5-20% fuel at 2500 to 4000 rpm, up to 20% load.
As long as I modulate throttle every 5 seconds or so, lurching is gone !
I added a potentiometer as a voltage reducer to o2 sensor; Works perfectly.
I can adjust closed loop afr while riding. The low speed jerking is completely gone at 13.5 afr.
 
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