Repsol Honda, LCR Honda and the Factory Yamaha team began a private three-day test at the new Circuit of the Americas in Austin, Texas on Tuesday.
The test marks the first ever laps for full time MotoGP competitors at the circuit, American CRT wild-cards having been the only previous grand prix bikes to test at the track.
COTA, which impressed on its F1 debut late last year, will host its first MotoGP race from April 19-21, as round two of this year's world championship.
As this week's test is not official, lap times are as provided by the teams.
for pictures from the test...
1. Marc Marquez
ESP Repsol Honda (RC213V) 2m 5.620s
2. Dani Pedrosa
ESP Repsol Honda (RC213V) 2m 6.140s
3. Stefan Bradl
GER LCR Honda (RC213V) 2m 7.307s
4. Jorge Lorenzo
ESP Yamaha Factory (YZR-M1) 2m 7.388s
5. Valentino Rossi
ITA Yamaha Factory (YZR-M1) 2m 7.924s