Image: Supplied.

Australian MotoGP rider Jack Miller returned to Valencia on Tuesday for the official post-season test, shaking down Yamaha’s all-new V4-powered YZR-M1 prototype with the Prima Pramac team.

The revised engine configuration marks a significant shift for Yamaha, moving away from the inline-four layout as it targets a return to race-winning contention in 2026 and beyond.

Miller, 30, played a key role in the development process at Valencia, offering feedback to engineers after completing 51 laps and clocking a 1:30.864s lap-time for P20 on the timesheets. Pramac will stay for a private test on Wednesday, before the program heads back to the factory for the European winter.

“It was a busy day as we tried to understand the new bike and provide solid feedback,” commented Miller after Tuesday. “There‘s a lot to do, and we‘re working on it. This bike has only a few days of life so far, and it‘s still very much a work in progress, but we‘ll keep pushing.

“We know the strengths and we know the weaknesses – now it‘s our job to give the engineers the most precise feedback possible so they can work over the winter to find the best solutions.”

Miller was joined by three-time WorldSBK champion Toprak Razgatlioglu, who completed his first laps in the team’s colours and finished 18th via a 1:30.667s lap-time as he prepares for a maiden MotoGP World Championship campaign next year.

The manufacturer also had both Monster Energy Yamaha MotoGP riders on board the new motorcycle, with Fabio Quartararo recording the 15th fastest time and Alex Rins classified P19.