Caution: The gas cable is sensitive to bending and therefore requires special care during installation. A single slight bend in the cable can cause the cable to break later. Therefore, it is prohibited to install cables with bends.
Press the gas pedal all the way down (full throttle position) and in this position, fix the gas pedal with a suitable board inserted between the pedal and the seat.
Press the throttle lever to the full throttle position and tighten the adjusting nut until the throttle cable is taut.
Release the gas pedal.
Information obtained from this online resource BMWMan