[superlightmaxx]

Thanks for your help BrianG

yes disabled the esc bec by removing the black jumper.
About the capacitor, the wiring diagram connect it in channel 3 but mine is already taken by my 1st/2nd gear servo as I still use it.
Just realised that my Bec was pretty close to my motor wires so i'll try another position maybe that will fix it. If it still doesn't work i'll blame it on the cheap chineese unit I used! lol

thanks