The Italian was fastest in the test that took place a day after Sunday's Brno race, beating Marc Marquez by 0.018s with a lap set at the very end of the session.

Yamaha's test programme included trialling a new aero fairing, which was aimed at giving the M1 bike more acceleration, according to Rossi's teammate Maverick Vinales.

But, while Rossi says the fairing made the bike easier to ride, he will not use it for this weekend's Austria race because it also compromises top speed.

"Spielberg [is about] top speed always maybe it is not the best fairing for Austria," Rossi said. "For me, the top speed is very important and with this type of fairing you lose a bit."

"At the end it's like this the bike is more easy to ride, less wheelie, a little bit like the wings, but looks like now they check the data but it looks like we lose a bit [top speed].

"After, it can be a good option for other circuits."

As well as a new fairing, both Yamaha riders also sampled a new Ohlins carbon fork, a component Rossi says he will use at the Red Bull Ring this weekend.

"It is a good option," he said. "Yamaha already used it, Marquez tried on Saturday and continued and I think we will continue [to use it], yes."

"Really competitive" day for Marquez

Brno winner Marquez expressed his satisfaction with his performance during the test, during which he mainly focused on preparing for Austria and improving race pace.

"We try to avoid the wheelie because in Austria it will be important," said Marquez. "We saw the other manufacturers were working on that side with the different fairings.

"We didn't have any fairings but we had a few ideas to try and we will see there because in the end you need to find a compromise with good braking stability and good acceleration.

"Feeling was really good with the bikes, the cool temperature and the track was in a really good condition, it was a perfect way to try to understand a few setups thinking about Austria.

"Apart from that we try some kind of different front tyres and about the race, some on the electronic side. I am happy because we work on the race pace and I was really competitive."

Additional reporting by Oriol Puigdemont