Following Monday's Catalunya MotoGP test, a further official test is taking place at Aragon in Spain on Wednesday.
The Aragon test is a replacement for the Estoril test, cancelled due to poor weather.
Testing began at 10am and will conclude at 6pm.
Repsol Honda has chosen not to attend the Aragon test, as the new-spec front tyre - which will become standard from Silverstone - is not available. Some of the CRTs are also absent.
Round six of the 2012 MotoGP World Championship takes place at Silverstone from June 15-17. The Aragon round will form round 14 of the series, on September 28-30...
1. Ben Spies
USA Yamaha Factory Racing (YZR-M1) 1m 50.677s
2. Jorge Lorenzo
ESP Yamaha Factory Racing (YZR-M1) 1m 51.344s
3. Cal Crutchlow
GBR Yamaha Tech 3 (YZR-M1) 1m 51.415s
4. Andrea Dovizioso
ITA Yamaha Tech 3 (YZR-M1) 1m 51.721s
5. Stefan Bradl
GER LCR Honda MotoGP (RC213V) 1m 52.607s
6. Karel Abraham
CZE Cardion AB Motoracing (GP12) 1m 53.068s
7. Colin Edwards
USA Forward Racing (Suter-BMW CRT) 1m 53.969s
8. Yonny Hernandez
COL Avintia (FTR-Kawasaki CRT) 1m 54.208s
9. Nicky Hayden
USA Ducati Team (GP12) 1m 55.377s
10. Ivan Silva
ESP Avintia (FTR-Kawasaki CRT) 1m 55.495s
11. Michele Pirro
ITA Honda Gresini (FTR-Honda CRT) 1m 55.689s
12. Valentino Rossi
ITA Ducati Team (GP12) 2m 2.129s
Official Aragon MotoGP records:
AUS Honda 1m 48.451s
Fastest race lap:
AUS Honda 1m 49.046s