Overview
- Quartararo announced he will no longer assist Yamaha with next year’s bike after last weekend’s Aragon Grand Prix, where he said he was being used as a test rider.
- He says Yamaha refused to let him sample Pirelli’s new 2027 tyre compounds at the in‑season Red Bull Ring test, and he cites that denial as a key reason for withdrawing development support.
- During the Aragon weekend Yamaha repeatedly asked him to run new chassis parts and linkage revisions, feedback he judged negative, and he finished the race last after several offs.
- Yamaha has pushed back, defending its development choices and saying it will concentrate 850cc testing with designated riders and testers such as Augusto Fernandez and Andrea Dovizioso.
- The row raises a concrete risk to Yamaha’s 2027 programme because early tyre and 850cc testing yields crucial setup and benchmark data and manufacturers tightly control who can access prototypes.