In
1999, Harada moved up to the 500cc class to compete on Aprilia's 380cc V-twin race bike. He obtained top 5 finishes in the first 10 races, including podium results at
Paul Ricard and
Donington Park. However, the bike's performance subsequently faded and he could not improve his results. In 2000 he was less competitive, coming 16th overall. In
2001, he made another attempt to obtain a second 250cc world championship, taking 8 poles and three victories: the title, however, went to fellow Japanese
Daijiro Kato. For
2002, he entered the
MotoGP class aboard a
Honda two-stroke, but this proved to be his final year of professional racing, as he retired after a difficult season that saw him finish 17th overall. He ended his career with 17 Grand Prix victories, all in the 250cc class. == Grand Prix career statistics ==