Test teams from all six MotoGP manufacturers t𒁏ook to the track at Sepang on Wednesday, to be📖gin three days of fine-tuning ahead of the official test.

With no lap times available at private tests, the majority of interest was𓂃 on any visual changes to the machines - especially with wings no longer allowed.

Having led the previous winglet development, Ducati has been the subject of much spe🌞culation over its 2017 fairing. Are they keeping the final design secret, having found a way to retain some of the lost downforce within the new rules?

Ducati Corse general manager Gigi Dall'Igna increased the intrigue by admitting the bike on display at last week's team launch would certainly change by the first race due to 'developments and optimisatio🀅ns'.

"We have 'something in the pocket'," he said.

But it wasn't th💫e front of the GP17 that caused a stir at Sepang on Wednesday - it was the rear.

To be precise a new 'box' is now located under the tail unit, with the exhaust re-routed aroun🧜d the right-hand side of the🐈 structure, instead of being in the centre as previously.

Another view of th🎃e off-centre Ducati exhaust at Sepang, alongsid𒉰e a studio picture released at last week's team launch. -- wuqian0821.com MotoGP (@crash_motogp)

So what is in the box and what is it for?

Is it related to the performance of the exhaust - a report on a Ducati 'jet exhaust' patent appeared only last week - or, at the other extremಌe, simply a storage uni♉t for something like electronics. But if so, what has now taken their original place?

wuqian0821.com asked test rider Michele Pirro about the new addition to his mach𝓡ine.

"It's to put sꦫalad inside... a hot dog... some coca cola... In case I get hungry after ten laps!" Pirro smiled.

We𝐆ll, it was worth a try. It remains to be seen if the box appears on the machines of race riders Jorge Lorenzo and Andrea Dovℱizioso next week.

Both of Pirಞro's bikes had the new box fitted on Wednesday. One bike was a black, wingless, GP17 on which he spent most of his time. The other bike, also described as 'new', was painted in race colours, but still had 2016-spec wings.

VIDEO: Michele Pirro flat out on tꦡhe main straight at Sepang with the new GP17 Ducati (Gigi Dall'Igna looks on). -- wuq𒁃ian0821.com MotoGP (@crash_motogp)

The day began on a wet but drying track, with rain returning late in the afternoon. Pirro rode in both the dry and wet.

"It was strange conditions today, with the rain and it is difficult to completely dry this new asphalt. But it's okay. We start a new season today and 🥂our job was only to check if the new bike is okay. The control systems. And at this moment, no big problem.

"I rode the bike with no paint (black) on the fairing so there would be no damage if I fell! Maybe tomorrow I'll try the bike with wings. Tomorrow I'll continue with the shakedown, because it's an all-new bike. But the base🍷 is good. Casey will also be here tomorro💖w also."

Suzuki test rider Takuya Tsuda also put in s💖ubstantial laps in the wet, an area of weakness for the GSX-RR last season, with 💫new BSB signing Sylvain Guintoli also unafraid of the rain on the new GSX-R superbike.

Yoshimura has i💮nvited Guintoli, plus Suzuki's MotoAmerica riders T🌟oni Elias and Roger Lee Hayden to help develop the new machine alongside factory test rider Nobu Aoki.

MotoGP and Superbike machines from Hondaꦜ and Yamaha were also on track with Japanese ꦬtest riders, while Mike di Meglio was at the controls of the Aprilia RS-GP and Mika Kallio the KTM RC16.

The private Sepa📖ng test continues on Thursday and Friday, with the official test - attended by all 2017 race riders - starting on Monday.

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