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MotoGP is back at Sepang for the second official 3-day test after a two week break to go over data and build some new bits for the 2015 machines.

Malaysian weather interrupted the 8-hour test session, with rain and slippery asphalt in the afternoon, so Rossi’s early 2’00.414 stayed atop the leaderboard.

For an in-depth report on Sepang 2, Day 1, head over to MotoMatters to read David Emmett’s comments on such topics as:

• How the Ducati GP15 looked
• The Yamaha seamless gearbox’s progress
• Troubles for Repsol Honda’s Marc Marquez
• A struggling Aprilia effort
• Progress for satellite riders Crutchlow and Redding
• Progress (finally!) for the customer Hondas of Hayden and Laverty

Photograph: ©2015 Yamaha Motor Racing Srl

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Valentino Rossi Sepang Test 2