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The hour of truth is at hand. On Monday morning, MotoGP fans will get their very first look at how the 2016 season is really going to look like. We got a glimpse at Valencia, but it was not a uniform picture.

Though the 2016 electronics and Michelin tires made their debut at the two-day test after the final race of 2015, there were still too many variables.

Everyone was on the Michelins, but some riders were on the spec-electronics, others were on the old proprietary software they had been using for the 2015 season, and the factory teams were using a mixture of both.

It was also the first time the teams had to focus solely on the new tires and electronics, without the pressure of an ongoing championship. Though for both Valentino Rossi and Jorge Lorenzo, the intensity of the season finale had left them drained, making it difficult to generate the necessary enthusiasm for testing.

There was a lot of work to do, for everyone concerned, and nobody did anything but scratch the surface.

Casey Stoner got the first testing miles of his return to Ducati under his belt on Saturday. The Australian started slowly and steadily, doing a lot of short runs to get a feel for the Ducati Desmosedici GP15, on which he spent most of the day, before upping the pace later in the afternoon.

Journalists present at the test said Stoner looked a little stiff in his early laps, not getting either elbow or knee down, but soon started to relax, and look more like his old self.

He had every reason to be wary: the last time Stoner rode a race bike on the road was during the Suzuka 8 Hours, where a throttle cable malfunction saw him thrown from the bike, injuring his scapula and tibia in the process.

Furthermore, this was his first time on a MotoGP bike for a year, his first time riding the Ducati GP15 – a very different beast indeed to the GP10, the last Ducati Stoner raced – and his first time on the Michelins. Despite that, he told reporters he was very happy with how the test went.

We will miss the one-wheeled antics of Jack Miller, as the Australian is to miss the Sepang MotoGP test, due to start on Monday, February 1st.

The Marc VDS Racing rider broke the bones in his right leg during a motocross training accident two weeks ago, and will not be fit in time for the opening three-day test of the 2016 MotoGP season.

Miller is continuing his recovery, and already back in training, working on his fitness with the aim of being ready to participate in the second MotoGP test, at Phillip Island in his native Australia, on February 17th.

Aprilia’s MotoGP project has suffered a setback. The 2016 version of their RS-GP MotoGP machine will not be ready in time for the first official IRTA test at Sepang, according to a report by Crash.net’s Neil Morrison.

Instead, the 2016 Aprilia RS-GP will make its debut in a private test at Qatar, ahead of the third preseason test of 2016, with its first public outing coming in that third and final test, two weeks before the start of the 2016 season.

The delay is a sign that the project is at least a couple of weeks behind schedule. At Valencia, Aprilia spokespersons said that the original plan was to hold a shakedown test at a private Italian racetrack, with the bike making its public debut in Sepang.

Designing a radically new bike is taking longer than expected, however: the 2016 machine will be a brand new prototype, designed from the ground up, at least 10kg lighter than the current RS-GP, and is rumored to have a different angle between the cylinders.

Jack Miller has broken his right leg in a motocross training incident. The Australian was riding at the Bellpuig motocross track in Spain on Sunday, when he landed heavily, fracturing both the fibula and tibia down near the ankle joint.

In a post on Instagram, Miller explained that he had been forced to shut off the throttle when another rider lost control on the up-ramp of a triple-jump. He had not crashed, but the impact of the landing had caused the damage to his ankle.

Miller was taken to the Dexeus Institut in Barcelona, where he was examined by Dr. Mir, and then had both the bones in his leg plated with screws. Examination after the surgery confirmed that it had been successful.

The injury to Miller does mean that his participation at the first test of the year at Sepang is in doubt. In a press release issued by the team, Marc VDS team manager Michael Bartholemy stressed the importance of waiting until the Australian was fit enough to ride.

It is no secret that Honda are struggling with the engine for the RC213V MotoGP. HRC have been making the engine ever more aggressive for the past three years, but in 2015, they finally went too far.

The power delivery of the RC213V was too difficult to contain, even with Honda’s electronics, and HRC suffered their worst season in MotoGP since 2010.

Things had not been looking much better for 2016 either. The engine Dani Pedrosa and Marc Márquez tested at Valencia and Jerez last November was at best a marginal improvement, with a bit more power at the bottom end, but still delivered in a very aggressive manner.

Added to this, HRC have had problems with the new unified software which is compulsory for 2016. Where Ducati, and to a lesser extent Yamaha have managed to integrate the less complex spec software into their engines, Honda have yet to get a handle on it.

That has made assessing the engine character even more difficult for Pedrosa and Márquez, the Repsol Honda riders finding it hard to pinpoint aggressive and abrupt throttle response on the engine character, the cruder software, or the interaction between the two.

It is a problem that Honda is now acknowledging publicly. HRC boss Shuhei Nakamoto admitted to the Spanish sports daily Marca that they were having trouble making their engine less aggressive.

Aleix Espargaro has fractured a vertebra in a training accident. The factory Suzuki rider was out training on an off-road bike, when he landed heavily from a jump, and felt pain in his back.

He was taken to hospital, where an MRI scan revealed a flexion fracture of the vertebra, which will force him to miss the Sepang test planned for next week.

The injury suffered by Espargaro should not see him out of action for long. The Spaniard was discharged from hospital on Friday morning, and will now have to rest for a two to three week period to allow him to recover.

One of the more intriguing match-ups of the 2015 MotoGP season is the battle between the two newcomers from the support classes. Maverick Viñales and Jack Miller are both close friends and fierce rivals, sharing a motorhome off the track, doing battle on it.

Viñales has come to MotoGP early, after just a single year in Moto2, where he was very competitive within a short space of time. Miller has made an even bigger jump, skipping Moto2 altogether and heading straight to MotoGP from Moto3. It is a huge leap for the Australian, switching from a narrow, 55hp, 80kg razor of a bike to a 158kg, 250hp monster.

So how have they adapted? Though the two are only a few days apart in age, comparing their progress is fraught with difficulty. Viñales, riding the Suzuki GSX-RR for Suzuki, is on a factory prototype inside a factory team.

Miller, on the other hand, is riding an Open class Honda RC213V-RS with the LCR team. Viñales has a large team surrounding him, with sufficient backing to act on his input.

The departure of Bridgestone and the arrival of Michelin as the official tire supplier to MotoGP is an extremely delicate operation, in terms of marketing, tire development, and motorcycle set up.

Bridgestone have paid a lot of money for the exclusive rights to MotoGP branding with their tires for 2015; Michelin have done the same for the rights from 2016 onwards.

Neither company wants to tarnish their brand or see the value of their investment diminished, either by rider comments expressing a preference one way or another, or by lap time comparisons showing either firm up.

This posed problems for the Michelin test, held on the fourth day of the Sepang MotoGP test. After the factory test riders had tried the Michelins at the first Sepang test, it was the turn of the MotoGP regulars.

To avoid any comments which might favor one factory or another, Bridgestone imposed a blanket ban on riders or team members speaking to the media after the test.

All Bridgestone branding was removed from bikes and leathers, and no visible Michelin branding was allowed, even down to the manufacturer’s logo on the tire sidewalls.

With major money on the line, the PR gag-order was enforced rigidly, and observed religiously. No official times were released, nor made unofficially available by the teams.

A range of times have seeped out from journalists present, but given that only a few laps were timed by a few people out of practice with using a stopwatch (or its modern equivalent, the smartphone), those times can be taken as guidelines only.

Though the riders competing in the 2015 MotoGP championship have all departed, the factories stayed on at Sepang for another day of testing. For the fourth day of the first Sepang MotoGP test was designated as a test day for Michelin, who are due to take over as official tire supplier from 2016.

The legal complications of the change from Bridgestone to Michelin mean that the tire test is shrouded in confidentiality, rather than secrecy. This test features only the test riders, all of whom have been barred from talking to the press about the tires.

Times were not recorded, and definitely not released, though a handful of hardy journalists stood at trackside with handheld stopwatches (or smartphones) and tried to time riders that way.

Who has the best bike? Is it Honda? Or have they been passed by Yamaha? Did the first MotoGP test of the year at Sepang answer that question? After Monday, we thought the answer was yes.

After Friday, it’s clear that it’s not clear. There is still a long way to go to the start of the season, and the only thing we can be sure of is the fact that this is going to be a fantastic year in MotoGP. When it’s hard to point to who has an advantage, it means the racing is going to be tight.

So how did the balance of power swing from Yamaha to Honda? Yamaha turned up at Sepang with a bike that was ready to go. They had plenty of parts to test, but following the Yamaha philosophy, all of those parts offer just a small, but positive change.

The bike was fast, and got a little bit faster. That meant that Yamaha were quick on the first day, and got a little quicker day by day.

Honda, on the other hand, turned up with four different bikes for Marc Márquez, and three for Dani Pedrosa, and the two Repsol Honda riders spent the first day of the test running back-to-back comparisons.

They had pretty much narrowed down their choice by the end of Wednesday, confirming their impressions on Thursday, then getting on with the job of improving the bike through Thursday and Friday.