 Max Biaggi handed the four-stroke Yamaha YZR-M1 its first win in the Czech Republic Grand Prix at Brno, while Rossi had to retire due to tyre problems.In that race, Honda also expanded their four-stroke presence by providing the RC211V bike for Honda Gresini rider Daijiro Kato.Rossi then won two consecutive races in Portugal and Brazil, clinching the world championship in the latter.