Hello I posted a couple of days ago with a greenacre cs2/16 I'd bought broken turned out the Pas wires had been butchered and put the wrong way round. So I changed them and all was well, so when I pedal it helps and when I stop it stops. So in the light my LCD display is not showing speed, although the display is working or I can change the assist level etc; 2 power delivery is jerky ie nothing then everything, but it's also fast I can't tell the speed but it's got to be 20mph+ in assist 5, it's rocketing; does the LCD screen have a way to turn speed display off and or limit the speed many thanks