Suzuki MotoGP star Maverick Vinales admits some riders are feeling the pressure to get on top of the new unified ECU software.

With the opening day in Phillip Island mostly lost to bad weather there are now just five more days of official testing before the racing season begins in Qatar.

While Ducati and Yamaha appear to be on top of the new single software Honda, Suzuki and Aprilia still look to have plenty of work to do.

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Despite the showery conditions, Vinales put in 20 laps on his GSX-RR to try and salvage some electronic progress from the damp opening day, setting the second best lap time to Pramac's Danilo Petrucci, albeit several seconds off lap record pace.

"These new electronics are putting all riders under pressure, we still have so many things to learn before we can manage it properly, but this is also something that is renewing the enthusiasm," Vinales said.

"I spent all the Winter training to get fit, now it's time to focus on the machine. In Sepang we had some positive improvements which gave me positive feelings, but now I'm really curious to continue the development and get closer to the top."

Team-mate Aleix Espargaro did not ride on day one.

"We preferred not to risk anything and wait for the upcoming days," he said. "When conditions are not consistent you can't control the electronics properly; and then it's very hard to test the tyres' performances."

However there was still a second Suzuki on track in the form of test rider Takuya Tsuda, who also rode yesterday in more consistent conditions to again concentrate on the new electronics.

The Japanese is also believed to be running the second phase of Suzuki's new gearbox, which allows seamless downshifts as well as upshifts.

It is not yet clear if the race riders will also try the development in Australia, as had been planned, and they may now have to wait until Qatar.