Satellite Ducati riders Karel Abraham and Hector Barbera made their 1000cc MotoGP debuts during this week's Valencia test.
Both had spent this season on 800cc Desmosedicis, Abraham will remain with Cardion AB for 2012, while Barbera is switching from Aspar to Pramac.
Both were riding the same aluminium frame bike as factory star Valentino Rossi.
After a few teething problems on the opening day, Czech rider Abraham rose from tenth to seventh on the Wednesday timesheets.
Abraham finished 1.6sec behind Dani Pedrosa (Honda), but was only 0.101sec slower than factory Ducati rider Valentino Rossi.
"We had a lot of problems, especially with the grip of the tyres," Abraham had said at the end of day one. "At the beginning we also had problems with the clutch and then we had to change the set-up of electronics several times."
Those issues were quickly solved on day two.
"During the first few laps we solved most of the problems we had and then we tried many things and focused on the set-up of the motorcycle," said Abraham, who improved his lap time by almost one-second on day two.
"I'm quite satisfied with the result of the test, but I think I could set even better lap time. I spent most of the time on track in the morning and then I was quite tired in the afternoon, but I'm happy with the way I ended my first season in the premier class and now I'm looking forward to winter break."
Barbera, starting preparations for his third MotoGP season, was one place and 0.215sec behind Abraham on the timesheets.
"These have been two days of work where we didn't look for the fastest lap time, but we were looking to learn about the many innovations that Ducati has brought us on track," said the Spaniard.
"Sincere compliments to them as they did a great job. The bike is very powerful although there is still some things to fix. We encountered a few problems but otherwise the bike is really competitive.
"The engine is fun, very different from the 800cc used until Sunday, and this I think may be a point in my favour as my style of riding. A pity that the last two hours available today we could not get on track because of a problem with the engine that I felt on the track. Engineers are analysing what happened.
"We also had the opportunity to compare the new tyres and also here, with some positive aspects, I think there's still a little work to do. The new ones make the most in the first lap.
"The shoulder I have injured at the end of the season gives me a little pain, but does not affect my results on the track. I think this break will do me good to recover and be at the top for the next season!"
The next test will start at Sepang, Malaysia, on January 31.