Suzuki's Aleix Espargaro declared himself 'very, very happy' with the progress of the new GSX-RR at the second Sepang MotoGP test.

The Spanish rider clocked his best time in 2m 00.275s as he finished an impressive tenth fastest on the combined leaderboard, 1.160s down on Repsol Honda's Marc Marquez.

Espargaro shaved one second off his previous best lap on the Suzuki at the Malaysian circuit and says he could have lapped even quicker had it not been for a few errors as he attempted a fast lap.

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"We are satisfied with today's [Wednesday] results, we ran a lot in hot conditions because yesterday we had some issues with those conditions with more than 50 laps," he said.

"I'm very, very happy with the improvements on the pace. I'm missing the fast lap because with the two soft tyres I made a couple of mistakes.

"The bike is very improved, we worked a lot on electronic set-up and to find a better configuration of the traction control, which gave good results and let us cut one second off our time," Espargaro added.

"We also worked on traction out of corners and it was important to verify the bike's behaviour in hot conditions because they are similar to race conditions. We still have a lot of work to do but I'm confident and aware that I'm in a factory team with a lot of people working hard to do the best job."

Espargaro's team-mate and MotoGP rookie Maverick Vinales was 14th fastest overall, setting his best time in 2m 00.604s.