Ducati's Valentino Rossi left Sepang frustrated after development stalled on his Desmosedici GP11.

Valentino Rossi has vented his frustration following the second MotoGP test of 2011, held at Sepang in Malaysia this week.

The nine-time world champion concluded the test 11th fastest, almost two seconds off the pace from Aussie Casey Stoner’s best and he says it’s just not good enough.

Italian megastar Rossi lost an entire day of testing as he spent Wednesday in bed with a bad flu, affecting the ongoing development of the Ducati Desmosedici GP11.

“We can’t be satisfied with this test because we didn’t reach our goals, which were to finish close to the top six and especially to reduce the gap to the front,” Rossi commented.

“Instead, we’re 1.8 seconds back, and our rhythm is also lacking. After the first day, we thought we could do it. We had started well and were able to make the bike work with the hard tyres, which is good. After that though, we didn’t take steps forward.

“Although we have some good ideas for the electronics that I’m optimistic will solve those problems relatively easily, I’m not as confident about the chassis setup.

“We tried hard, but we haven’t yet managed it. I’m able to brake hard, but I’m still having trouble in mid-corner.

“It was definitely a disadvantage to only ride two days instead of three because we had to rush at the end and try many things in order to understand as much as we could.

“We were prepared for that possibility, but it started to drizzle, making it impossible to push. There could be some good solutions for the future, but we weren’t able to confirm them.

“This circuit hasn’t traditionally been favorable to the Ducati. The next test is in Qatar, where the track is different, so we’ll see if we can go faster there.”

The Qatar test will be on track for 13-14 March at Qatar’s Losail International Circuit for the final winter test, prior to the MotoGP season opener at the same venue.