At the extremity of the exhaust camshaft of each cylinder head is a centrifugal decompressor. On start-up, the device allows the profile of the cam opening lobe to be modified, resulting in a slight lift of the valve that discharges part of the mix contained in the combustion chamber during the engine's compression phase. This effect makes it possible to reduce the resistance to the motion of the piston in the compression phase. Once the engine is started, the increase in rpms and the relative centrifugal force modify the configuration of the device, cancelling the effect of the valve lift and bringing the engine back to normal operating conditions. This ingenious device facilitates the starting of the Superquadro engine without having to use a more powerful battery and a large starting motor, in turn making it possible to reduce the overall weight of the vehicle by 3.3 kg. The system further underlines the synergistic strength achieved by engineers and designers in the intense effort to reduce the bike's weight.