I added a potentiometer as a voltage reducer to o2 sensor; Works perfectly.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 !