Valentino Rossi gave an early thumbs-up after testing a new chassis on his Movistar Yamaha YZR-M1 at Jerez.

Rossi and team-mate Jorge Lorenzo both experimented with the new upgrade, which has been designed to improve braking stability.

The Italian star, who finished sixth fastest on the combined time sheets after FP1 and FP2 in Spain on Friday, said: "We tried a different chassis today especially for the braking stability and the first impression is not so bad, it's just a small step to understand the way to go."

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Blazing hot temperatures resulted in rear grip issues in particular at Jerez especially in the afternoon session, but Rossi was satisfied with his pace overall after clocking a best time of 1m 40.125s in FP2, 0.768s down on pace-setter Aleix Espargaro.

"The track is very greasy so it's difficult with the front and rear tyres with the high temperatures. It's difficult to control the bike and it slides a lot," he said.

"I was quite fast from the beginning to the end and also in the section I am not so good in. We have to work very hard because the track is clean but there isn't a lot of grip, so we spin a lot. It is very difficult in the afternoon for the tyres because it is very hot. We tried to work on the pace and rhythm, but I am not so bad because I can get into a good rhythm, so with the used tyre, more or less the top riders are on a similar level.

"We have to improve and work on the bike and do better tomorrow though, because tyre choice will be interesting. Front and rear, it's still not decided."