Marlboro Ducati's Nicky Hayden says Ducati have gone backwards in terms of developing their MotoGP Desmosedici after the American finished yesterday's Motorland Aragon race a full 25 seconds slower than he did the previous year.

Hayden admits that an off-track excursion added a couple of seconds to the total and some of the increased time could be down to him but not the full amount, adding that the team needs to sit down a figure out a direction, given that team-mate Valentino Rossi has said the new aluminium chassis hasn't fixed their problems.

"I don't think I am 25 seconds slower. The rider can take some of the heat but not that much. Twenty five seconds is a lot. I did run off the track for a couple of seconds but we don't have the answer. We have tried a lot of stuff, maybe too much stuff," said Hayden, speaking to bikesportnews.com.

"It's clear we are not making any real progress. They're working hard but I think we have gone backwards, truthfully. Looking at too much stuff and doing things. We're not going to stay home or give up. This is the first proper race I have done with this bike and it is clear we have gone wrong somewhere. I'm not exactly sure. Casey was fast but Spies, Lorenzo, guys like who didn't change bikes were also slower but we don't understand it.

'We are so far off we want to look, look, look at so many different areas and we probably didn't do a good job - maybe we have tried too much in one season but a lot of it is looking forward to next year. We need to try some stuff and figure out a direction."