Nine-time world champion Valentino Rossi hasn't yet found an answer to the lack of acceleration he is still experiencing with the 2018 Yamaha M1 and only has one day left of the Buriram MotoGP test to come up with a solution.
Rossi described it as a difficult day after he finished 14th on the timesheets and some late one-lap pace from team-mate Maverick Vinales will have just rubbed salt in the wound.
"It was a difficult day, because we started this morning in quite a good way, I did some good rhythm and I was faster compared to yesterday and was not so bad," said Rossi, speaking at the track.
"But after, we have a long list of things to do, we have a lot of work. We worked a lot with the setting to try to improve, we worked a lot with the electronics to try to improve the acceleration, but sincerely, we didn't find a good solution. Unfortunately during the day, we are not able to improve.
"At the end, in the afternoon, we also tried some different tyres for Michelin, because it looks like they modified the casing for the October race, but sincerely, I didn't feel very good, so we need to do something else tomorrow."
