Yamaha's Jorge Lorenzo and team-mate Valentino Rossi reveal they are concerned about the pace of their rivals Honda, after the first of a three-day pre-season test at the Circuit of the Americas in Texas,
Seven-time world champion Rossi, who completed the most laps, describes Honda's pace as "impressive".
MotoGP rookie Marc Marquez was fastest on day one, ahead of his Repsol Honda team-mate Dani Pedrosa, while the likes of Ducati and the Tech 3 Yamaha team, which includes British riders Cal Crutchlow and Bradley Smith, are not attending the test.
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Day 1 test results:
1. Marc Marquez - Repsol Honda Team - 2'04.619
2. Dani Pedrosa - Repsol Honda Team - 2'05.047
3. Jorge Lorenzo - Yamaha Factory Racing - 2'05.291
4. Stefan Bradl - LCR Honda MotoGP - 2'06.053
5. Valentino Rossi - Yamaha Factory Racing - 2'06.507