 During the war he was with the 8th Motorcycles Unit, stationed at Padova.In 1925 Mario Mazzetti, impressed by Alfonso's work, asked him to build a single-cylinder 120 cc two-stroke racing bike, making Alfonso the designer, constructor, and racer.They were successful racing, under the MM name, and Alfonso's finest racing moment came in 1927 when his MM 125 took six world records at Monza, during the Grand Prix of Nations.