The three-day test is being attended by the majority of teams and riders - with the notable exceptions of Fiat Yamaha and Repsol Honda's
Dani Pedrosa (injured).
Heavy morning rain reduced the number of Thursday laps but the track dried fully during the afternoon, when world champion Casey Stoner lowered his best time yet again on race tyres.
Kawasaki's John Hopkins required a trip to hospital to have a groin injury examined after falling in the wet.
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1.
Casey Stoner AUS Ducati Marlboro Team (B)
1min 29.938 secs
2.
Alex de Angelis RSM Honda Gresini (B)
1min 30.449 secs
3.
Andrea Dovizioso ITA JiR Team Scot (M)
1min 31.074 secs
4.
Shinya Nakano JPN Honda Gresini (B)
1min 31.316 secs
5.
Nicky Hayden USA Repsol Honda Team (M)
1min 31.373 secs
6.
James Toseland GBR Yamaha Tech 3 (M)
1min 31.451 secs
7.
Marco Melandri ITA Ducati Marlboro Team (B)
1min 31.478 secs
8.
Loris Capirossi ITA Rizla Suzuki MotoGP (B)
1min 31.545 secs
9.
Randy de Puniet FRA Honda LCR (M)
1min 31.575 secs
10.
Colin Edwards USA Yamaha Tech 3 (M)
1min 31.593 secs
11.
Chris Vermeulen AUS Rizla Suzuki MotoGP (B)
1min 31.774 secs
12.
Anthony West AUS Kawasaki Racing Team (B)
1min 32.242 secs
13.
Toni Elias SPA Alice Team (B)
1min 32.246 secs
14.
Sylvain Guintoli FRA Alice Team (B)
1min 32.431 secs
15.
John Hopkins USA Kawasaki Racing Team (B)
1min 42.130 secs
Fastest day one times:
Colin Edwards USA Yamaha Tech 3 (M)
1min 29.566secs (Qualifying tyres)
Casey Stoner AUS Ducati Marlboro (B)
1min 30.178secs (Race tyres)