Valentino Rossi says it is up to Ducati to rectify problems with its 2012 challenger, and that his confidence in his own abilities has not been diminished by his struggles on the Desmosedici.
Ducati made a multitude of changes to the GP12 in the wake of a first winless season in 15 years for Rossi in 2011, but the Italian still struggled and could only finish 10th in the season-opening Qatar Grand Prix.
Team-mate Nicky Hayden finished sixth, while the satellite Pramac Ducati of Hector Barbera edged Rossi out late on to capture ninth.
While such a slump has led to widespread questioning in his native Italy, Rossi says he is confident he can still perform - and that his problems lie instead with the handling of the Ducati.
"Age penalises you, it's true, but a difficult year doesn't make you forget how to stay with the leading pack. In my opinion, I still know how to do it," Rossi told Motosprint.
"It's very clear who makes our bike: [Filippo] Preziosi is the boss and the thinking brain behind everything. It's up to him to help us.
"Our problems are very clear: what doesn't work at the rear, under acceleration, in my opinion comes from the front, and the cause is understeering. more here: http://www.racer.com/rossi-calls-for-ducati-to-help-riders/article/236010/