Factory Yamaha riders Valentino Rossi and Maverick Vinales have both fired more shots at bosses, saying some serious work needs to be done to fix the mistakes made in 2020.

The pair are both gambling on setups in morning warm-up to try and find something with which to challenge but the problems began at Sepang at the start of the year.

"It's important to give a direction to Yamaha because right now with the new bike we are a little bit lost. So we need to find a good direction that they can work in over the winter to bring something that really works on the bike," said Vinales, speaking at the track yesterday.

"In the winter, I tested the 2019 and 2020, and the 2020 bike was not better until there was a lot of grip on the track.

"When I tried the bike in Sepang I felt this and told immediately to all the staff. "My information was good and I said in Sepang, straight away, which bike I want for this year.

"But it was the bike we needed to ride for 2020, so I concentrated to make the bike better. If we look back, maybe we would choose another thing...

"At the end it looks like we made a mistake with the bike, for sure. Because last year's bike for me was more competitive in all the tracks, not only a few tracks.

"I think the decision is about the group. For sure when one makes a mistake, we all make a mistake because we need to ride with this bike.

"So we will need to pay a lot of attention for [next year], but I think and I hope this is the last time, that we learned a lot and we will try to choose the correct decision for the future.

"It's four years that we are doing mistakes, choosing the wrong things, looking to develop for me wrong ways. I hope next year with the Yamaha we can build up a complete bike for all the season, not just four or five races."

Rossi knew that more needed to be done for 2020 but he believes it this year's M1 felt the same as the 2019 and there have been no steps to improve.

Rossi: Last year it was a difficult season for Yamaha. We have to improve the bike in a few areas. The first aspect is the engine, the second is the grip on the rear wheel. But ever since I tried the new bike for the first time, the feeling for me has been very similar to last year's model.

"The difference is not very big. In my opinion, the problem is not that the new bike is worse than the old one. The problem is that it is very similar. We don't manage to take the step and improve, ”he said.

“I always try to explain as best I can what I feel on the bike and the problems I have from my point of view.

"But I have to say that the problems have remained more or less the same over the past few years.  To be honest, I still didn't understand how much they listen to me. So I'm not really worried about not being on the works team next year."