MotoGP: Rossi turns up heat on Yamaha

FORMER WORLD Champion, Valentino Rossi, says Yamaha need to be 'more

aggressive and more courageous' in the decisions surrounding the company's development plan of their MotoGP machine.

Sources say, the Italian believes the Japanese side of the squad must take a lot of responsibility for the team's problems.

In an interview with Italian magazine MotoSprint Rossi said:

"If we want to win the title again, then we need the people in Japan to put in more effort. They must work their butts off.

"For 2008 I have a contract with them. If they show me we can still fight, fine. Otherwise we could make a different choice."

Rossi believes he has been under a massive amount of pressure to deliver, admitting his disappointment with the development of the M1. The Italian also believes Yamaha need to be more courageous in their decisions.

"We need to stop suffering from the slowness of a big manufacturer," he said. "We need to be more aggressive and more courageous in the decisions and the development of the bike.

"This is what we have lacked this year. We had a big disadvantage at the beginning of the season, and it's not as if we improved so much in the engine. Besides, every time we do something new it breaks down."