 After the "150 Regolarità" model of the early fifties, MV Agusta had abandoned the off-road sector, but the popularity of this sector in the sixties caused Count Domenico Agusta to rethink the potential of this new market and ordered the construction of some dedicated machines.In 1963 an off-road competition motorcycle were prepared, the "125 Regolarità", derived from the "Centomila" model, with a five speed gearbox, reinforced frame and specialised suspension from Ceriani.The four-stroke OHV single-cylinder engine was developed to produce 12.5 bhp (9 kW) @ 8,500 rpm.