2004 Grand Prix motorcycle racing season

The 2004 Grand Prix motorcycle racing season was the 56th Road racing World Championship season.

The video game MotoGP 4 is loosely based on this season.

At the end of 2003, HRC and Valentino Rossi had parted ways, and HRC held Rossi to the letter of their contract which stipulated he could not ride another manufacturer's machine until 31 December 2003. Rossi's move to Yamaha, therefore, was a gamble on a manufacturer that hadn't had a world championship in 12 years. Rossi won the first round of the season and lay to rest doubts about whether the rider or the motorcycle was more important when he achieved what no rider since Eddie Lawson had done in the history of the premier-class: he won back-to-back championships on different marques, Honda in 2003 and Yamaha in 2004.

Runner-up Sete Gibernau gave Rossi a strong challenge initially, but faded towards the end of the season. The friendship between him and Rossi frayed over the season, and snapped completely at the Qatar round.

At the Italian round, the race ran for 17 laps before rain started, and according to the rules at the time, the race was decided on a second, 6-lap race and the previous 17 laps only counted for grid positions. Conditions dried enough that the riders started the new race in slicks instead of wet-weather tires. In 2005 the rules were changed so that rain would no longer stop a race in MotoGP.

Rookie of the Year was Rubén Xaus.

Points are awarded to the top fifteen finishers. Rider has to finish the race to earn points.

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