Movistar Yamaha's Jorge Lorenzo says the fact he clocked his fastest ever time at Sepang in less than perfect conditions gives a clear indication of the competitiveness of the YZR-M1.

Lorenzo was second fastest with a time of 1m 59.437s as he finished only 0.322s behind world champion Marc Marquez and hailed the time as a 'step forward' at the Malaysian track.

The Spaniard and his team-mate Valentino Rossi have tested Yamaha's new seamless gearbox at Sepang but Lorenzo said the long-awaited part was not yet perfect, without elaborating further.

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"It was a good day, similar to yesterday in terms of the speed and consistency, maybe a little bit better today," said Lorenzo.

"I made the fastest lap ever for me in Sepang and even on a fairly slippery track we've been able to be faster, so that means that the bike especially at this track is a step forward.

"The bike is smoother, the tyres have more grip and the physical condition is better [compared to Sepang last year] so it makes everything better and you feel the difference," he added.

"The gearbox is not perfect in some ways but I cannot explain more."

Lorenzo highlighted the performance of the Movistar Yamaha under braking as one of the big positives from test, making advances without compromising other aspects of the handling.

"Stopping has been the only difference between Sepang 1 and this test. Luckily we gain on the braking but we don't lose in other areas. We need to try to try to take another step forward to try to understand the best solution for this gearbox and then try to improve the other areas of the bike," he said.

"Some days it seems like the Yamaha is strong, other days it is the Honda. This track is very difficult because it depends a lot on the grip of the tyre, the hour of the day; this track is very strange and we need to go to Qatar to have a clearer idea.

"Sepang was very good for us and being as competitive here means something."

One area where Lorenzo is keen to improve is on acceleration in hit temperatures, particularly when the level of tyre grip begins to fade.

"We still need to improve a little bit on acceleration when the tyre drops and this will be our job for the future, especially in hot weather," he said.

The Spaniard attempted a race simulation on the final afternoon, but called it off due to the searing heat.

"At 3:30pm we tried a race simulation in the highest temperature I've ever ridden here in Sepang; it was really difficult to keep a good lap time and pace, the bike felt not so good with so much temperature," he explained. "I decided to stop as I wasn't feeling confident in braking. Everyone did a simulation at this time of day so I think they all had problems also."