Marlboro Ducati's Valentino Rossi will have to start tomorrow's Motorland Aragon MotoGP race from the pitlane and with a ten second penalty because he will step outside the 2011 engine allocation and use a seventh motor.

Rossi will go up to seven as an engine that he has used will not fit in the new aluminium chassis which has now been bolted to both bikes but the pragmatic Doctor says it will be good development work for 2012. The new chassis has an extra mounting point that lines up with the rear cylinder for the new spars The newer GP11.1 motors have this but the older engines don't.

"I think for tomorrow we can use the seventh engine, starting from the pit because unfortunately for to have two bike in aluminium we have to use another engine because the aluminium part was suitable for the engine of Misano but the other bike had an older engine so it's not possible," said The Doctor, speaking to bikesportnews.com this evening.

"We expect more from this afternoon because this morning was not so bad. With the race tyre, especially at the beginning of practice, I wasn't so far from the other guys and I think I don't deserve the 13th place because we were unlucky. I had a crash, unfortunately, and with the last soft tyre I was a little bit faster through sector one and I can make a better laptime but I did a mistake."