Aleix Espargaro admitted he was 'surprised' by the performance of Suzuki's GSX-RR at Sepang after finishing fourth fastest on Monday.

The Spanish rider lapped in 2m 01.055s to finish 0.641s behind pacesetter Valentino Rossi, completing a total of 50 laps.

Espargaro tested several new modifications on the GSX-RR that included a redesigned fairing, developed at Suzuki's wind tunnel in Japan.

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"It has been a positive day of testing because we made some improvements. The track was more slippery and dirty today so I had to get back the confidence, but I have very good feelings," he said.

"We are working on the performance improvement but working little-by-little, so I was a little surprised by the speed and power that the bike had today.

"I also had the chance to test the bike in wet conditions and I feel very comfortable: it is small and easy to handle so I feel confident," Espargaro added.

"Tomorrow morning we will try some set-up modifications and in the afternoon we will work on the pace; since it is maybe more important than the single lap."

His team-mate, Maverick Vinales, was ninth fastest, lapping in 2m 01.317s.