That is no clutch adjustment...
The aluminium adapter for the 2nd spurgear (the smaller plastic gear) has an hole, when turning the wheels you will see 2 screwholes passing by, one straight on the shaft and one under an angle. That latest one is the screw adjustng the shifting point. Turn it 90 degrees clockwise and it will shift later, try to get the right point.
Speed is only fiction but a 130+km/h MRS4 is for real.