2008 MotoGP rookie of the year Jorge Lorenzo admits he isn't sure what to try next, after hitting something of a time wall during day two of testing at Sepang.

The Fiat Yamaha rider, using the full 2009 YZR-M1 for the first time, has been tenth fastest on both days and - although he lowered his best lap by 0.8sec on Friday - the #99 can't seem to break through the 2min 3sec barrier.

As a result, Lorenzo was left 1.5sec from the front, something he can't understand after setting the third fastest race lap in October's Malaysian Grand Prix.

"It's been a hard day because we tried to improve our lap times but we couldn't," said the straight-talking Spaniard. "We don't know what the problem is because we changed a lot of things but the lap time is the same.

"I can't feel the front on corner entry and in the middle of the corner the bike starts to open the line. We don't improve. We are still in the same lap time.

"Maybe it is a matter of adapting to the Bridgestones because I was very fast and very good on the Michelin.

"I've tried to change my riding style but it hasn't worked yet. This is my first time with the new engine so it's possible that this has also changed the character of the chassis... anyway at the moment we are not fast.

"Physically I am fine; my injuries are not a problem.

"Tomorrow I just want to concentrate on doing laps and trying to adapt my riding style to the bike."

Lorenzo's team-mate Valentino Rossi was third fastest.

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