Capirossi made his World Championship debut at 125cc level, and in his first full season of Grands Prix he took his first title aged only seventeen. He finished in the top six on ten occasions, eight of them on the podium, and took wins in Britain, Hungary and Australia. The massed Italian contingent helped him out in the final round, but it was still an impressive achievement, with 182 points scored.His second season (1991) was even better, and saw him defend the 125 title fairly comfortably. He was only once off the front row of the grid, and had five pole positions, as well as four fastest laps. From thirteen rounds, he was on the rostrum for twelve, and finished sixth in the other. He came second five times, and was a winner in Australia, Malaysia, and three European venues. Of his 225 points, 200 of them counted, and were plenty enough to help him move up to the 250s.During this second season, Capirosssi and his team were sponsored by AGV Helmets and AGV Sport leathers.