Jack Miller suspects engine fault after two unrideable Yamaha races

Two consecutive unrideable weekends point to something systemic rather than a one-off setup miss, and Miller naming the engine specifically shifts the conversation from rider adaptation to hardware reliability. For a factory Yamaha effort already under pressure to close the gap to the front, a suspected mechanical root cause is a more serious problem than a difficult circuit or a bad setup call. The fact that Miller is flagging it publicly suggests the team hasn't yet given him a clear answer, which is its own signal about where the diagnosis stands.