Casey Stoner left Monday's Mugello MotoGP test having set the pace with a record-breaking lap at the Repsol Honda team's last non-grand prix track session with the 800cc RC212V.
From now on, whenever HRC team-mates Stoner, Dani Pedrosa and Andrea Dovizioso test - including during the next official outing at Brno in mid-August - it will be with next year's 1000cc machine.
The trio made use of the extra track time, just one day after the Italian Grand Prix, to try a new swing arm and then followed their own testing schedules.
Stoner, who led for 17 of the 23 race laps on Sunday - before tyre pressure problems saw him caught and passed by Jorge Lorenzo and then Dovizioso - left the pits just 15 minutes after the track opened.
The world championship leader went on to suffer a small crash - and was reportedly involved in an on- and then off-track argument with rookie Karel Abraham - on his way to completing 47 laps.
Stoner set a new circuit record of 1min 47.326 on his penultimate lap, which was seven tenths faster than his pole position time on Saturday, although only 0.096sec quicker than Gresini Honda's Marco Simoncelli, who was second best at the test.
In addition to the swing arm, Stoner tested a new Bridgestone front tyre.
"This morning the track was very dirty and I had a small incident going into turn one, but nothing major," said Stoner, whose lead over Lorenzo has been reduced to 19 points. "We had a few things to test here today, a new front tyre from Bridgestone which wasn't so different to the one we are currently using, perhaps just a little more contact feeling so it could be a good direction they are working in.
"We tested a new swing arm and had positive feedback, we found more traction and some more grip delivered a little earlier so I don't need to pick up the bike so much, which could help us in a track like Sachsenring where you spend a lot of time on the edge.
"In general we didn't test so much, the bike was very similar to the race day set up, we also tried something small on the rear suspension and this was also a small step forward."