Case closed. This was RapidBike problem. Precisely firmware problem. I got new firmware from RapidBike company to solve this. They also wrote me that they had few issues reported by RC390 owners so this was not only me :)
Hi.
I have problem with my RC390 2018r.
During acceleration (full opened throttle) bike cuts off in way similar like QS would do this (it just feels like QS).
I was looking everywhere and finally got to to the TPS voltage.
Happily I have RapidBike Racing installed that monitors TPS vlotage.
I...
Hello,
I have RC390 2019, I have installed RapidBike Racing + wideband o2 sensor.
The power gain was noticeable:)
Sadly it is not possible to alter rev limiter with RBR module.
As I heard this can be only done by flashing stock ECU with proper map.
I went to dealer and he connect service...