Fabio Quartararo warns Yamaha MotoGP rebuild could take months or longer.
He cited significant performance and reliability issues with the new V4 engine.
## What happened?
Yamaha undertook a major project to build a brand-new bike over the winter.
The Japanese manufacturer abandoned its long-running inline-four engine in favour of a V4 powerplant.
But the team largely struggled for performance and reliability during pre-season testing.
Quartararo even showed frustration with the bike on Saturday.
## Why it matters for Fabio Quartararo
At the end of the two-day Buriram test, all four Yamaha riders finished a second off the pace.
Pramac's Jack Miller led the quartet in 16th ahead of factory rider Quartararo.
The gap to the front was significant, with Quartararo concerned about the bike's long-run performance.
He said the new V4-powered M1 was slower than its predecessor over long runs.
## What comes next?
Yamaha had to pause its testing programme at Sepang earlier this month to investigate a safety issue.
The root cause was identified within 24 hours, but the team restricted engine mileage at Buriram.
Quartararo explained that the mileage of the engines was over, so they had only one bike.
He warned that Yamaha may need as much as the entire 2026 season to make its new bike competitive.
The new V4 engine lacks outright power, but Quartararo feels there are other areas where the 2026-spec M1 is struggling.
He said the turning of the bike and the grip are the weakest points.
Quartararo is struggling to make lap times go smoothly, with the tyre already worn.
He checked the race simulation and was in the high 1m30s, low 30s, low 31s.
But he is struggling because the bike is spinning straight, so there are many things to improve.
As a rider, Quartararo wants to fight for victory or at least try to make pole positions.
But he sees that they are still very far from that and will work as much as they can.
The 2026 season will be challenging for Quartararo and Yamaha.
They need to figure out how it is going and try to improve the bike.
Quartararo thinks it will be all year to make the new bike competitive.
He said they cannot find all that they need super quickly.
So, the team will work as much as they can to improve the bike.
Yamaha's new V4 engine project is a major undertaking.
The team needs to improve the engine, turning, and grip.
Quartararo is focused on making the bike competitive.
He will work with the team to improve the bike's performance.
The 2026 season will be a long and challenging one for Quartararo and Yamaha.
But they are determined to make the new bike competitive.
Quartararo finished the Buriram test in 16th place.
He was 1.3 seconds off the pace.
The team will continue to work on the bike's performance.
They will try to improve the engine and the bike's overall performance.
The next test will be crucial for Quartararo and Yamaha.
They need to make significant improvements to be competitive.
Quartararo is ready for the challenge.
He will work hard to make the bike competitive.
The 2026 season will be an exciting one for MotoGP fans.
Quartararo and Yamaha will be looking to make a strong comeback.
They will face tough competition from other teams.
But Quartararo is determined to succeed.
He will give it his all to make the bike competitive.
The team will work together to achieve their goals.
Quartararo's warning about the rebuild is a significant one.
It shows that the team is aware of the challenges ahead.
They are prepared to work hard to overcome them.
The 2026 season will be a test of their determination and skill.
Quartararo and Yamaha are ready for the challenge.
They will do everything they can to make the bike competitive.
The next few months will be crucial for the team.
They need to make significant improvements to be competitive.
Quartararo is focused on the task ahead.
He will work hard to make the bike competitive.
The team will support him every step of the way.
Together, they will try to achieve their goals.
The 2026 season will be an exciting one for MotoGP fans.
Quartararo and Yamaha will be looking to make a strong comeback.
They will face tough competition from other teams.
But Quartararo is determined to succeed.
He will give it his all to make the bike competitive.
The team will work together to achieve their goals.
Quartararo's warning about the rebuild is a significant one.
It shows that the team is aware of the challenges ahead.
They are prepared to work hard to overcome them.
The 2026 season will be a test of their determination and skill.