Suzuki concluded its 2013 European test programme with a two-day test session at Mugello this week.

The Japanese factory, which has postponed its MotoGP return until 2015, again fielded factory test rider Nobuatsu Aoki and Aspar racer Randy de Puniet.

The pair used track time at the Italian MotoGP venue to work on a revised engine and redesigned cowling - to increase top-speed - along with the team's newly-elected chassis design and electronics, that offer better traction control and engine braking.

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Following on from three days at Misano, Mugello provided more positive data regarding braking and corner-entry characteristics, plus a new direction in terms of rear-grip; an area Suzuki will look at further-developing during the next few months - and into 2014.

de Puniet's best lap time was a 1m 49.260s, which would have been the eighth fastest lap during June's Italian MotoGP, when Honda's Marc Marquez set a new lap record of 1m 47.639s. de Puniet recorded a 1m 49.910s on his way to eleventh place with the CRT-specification Aspar Aprilia in the race.

"In these two long days we've worked a lot on the electronic-mapping in different situations," said de Puniet. "We also understand that we need to work more on rear grip. We expected Mugello being a difficult track and from this test we gave a lot of information to the engineers, which they can now work on.

"I'm a little sad that this was the last test for this season, as I've enjoyed riding this bike and working with the Suzuki Factory Team. I hope I will have more opportunities to ride again in the future and to continue improving this bike."

de Puniet's 2014 plans are yet to be announced, with speculation that he could leave the Aspar team to concentrate on Suzuki test duties next year. Test team manager Davide Brivio gave no indication of whether the relationship with de Puniet - a podium finisher for Kawasaki and Honda LCR - will be extended, but praised his efforts.

"Randy has helped us a lot, even if at some times we've had to ask him for such a big effort between his regular MotoGP races," said the Italian, a multi title-winning team manager for Yamaha. "I would like to thank Randy very much for his contribution in finding strong and weak points of our project.

"His comments were - and will be - important for the development work we have ahead of us in the coming months. I would also like to thank the Aspar Team that allowed Randy to be available for this testing activity.

"The team staff was also great and I'm happy that we will continue this testing job together next year as well. Now we go back testing to Japan and looking forward to the next opportunity where we will be again on the track with the other strong MotoGP competitors."

Suzuki MotoGP project leader Satoru Terada confirmed that the factory does not plan to attend the official post-season test at Valencia in November.

"We concluded today's European testing for this year where we visited several circuits finding the weak points of our bike," he said. "A fast rider like Randy helped us on understanding better the level of our machine right now and so we can go back to Japan to look for the solutions.

"We have several directions where we can work-on now and I'm very pleased that we have been able to run for many miles on-track without any trouble on the bike: This is very positive looking at the future of our racing activity."

Earlier this year, Brivio told Crash.net why Suzuki was set to miss the Valencia test: "We were thinking of going to Valencia, in case we were racing in 2014. Now that we don't enter, it's probably - Valencia is at the end of the season, a busy test, very messy! So at the moment we are thinking to skip Valencia and make a proper plan for 2014."

The main changes to the MotoGP technical rules for factory entries from 2014 involves compulsory use of the standard ECU hardware and one less litre of race fuel. Those reasons were given for Suzuki - which withdrew due to financial reasons at the end of 2011 - postponing its return from 2014 to 2015.