Monster Yamaha's Valentino Rossi is still looking for more from the M1's powerplant after the first day of MotoGP testing at Valencia but is happy with the Iwata factory's development direction.
Rossi was the slowest of the Yamaha contingent, finishing ninth while Fabio Quartararo led the other three bikes in a clean sweep of the top positions, and was nine-tenths off the pace.
But The Doctor had plenty of positives things to say about the new bike - on which he spent all day, totalling 73 laps of the Spanish track.
"The first impression is quite positive, because we improved a little bit, but the way is long. Because the difference is quite a lot, especially in the top speed," said Rossi, speaking at Valencia.
"But I like the way that Yamaha is working because it's less confusion that in the past, the programme is more clear. This is still a prototype - so next year maybe we can have also another step, something more, but the feeling with the new bike is positive.
"For me, electronics and engine are the areas where we have to improve, especially the engine. But looks like that now Yamaha agrees."