The home star completed 66 laps of the challenging seaside circuit as he sought primarily to improve the rear set-up of his new 1200cc machine. Troy's best lap was a 1min 32.5secs, which placed him 0.3secs clear of his nearest rival - Yamaha's 2007 title runner-up
Noriyuki Haga - although still some 0.7secs adrift of the official race lap record.
Haga's compatriot
Yukio Kagayama scored the third fastest time for Alstare Suzuki, just 0.1secs further back, putting three different machines in the top three places.
Much Tuesday attention was focussed on former Alstare rider Max Biaggi, who made his Ducati debut with the Sterilgarda Go-Eleven outfit. The triple 2007 WSBK race winner finished the day one-second behind Bayliss, as Max and team-mate
Ruben Xaus set exactly the same lap time on their customer 1098R to be tied for seventh place.
Biaggi's replacement,
Fonsi Nieto, was an encouraging fourth quickest after running just a tenth ahead of current lap record holder
Troy Corser (Yamaha Motor Italia) and Bayliss' new factory team-mate
Michel Fabrizio (Ducati Xerox). Fabrizio fell at the top of Lukey Heights, hurting on his right foot in the aftermath of his slide.
With just a short amount of testing on the new ZX-10R completed so far, PSG-1 Kawasaki Corse riders
Regis Laconi and
Makoto Tamada sandwiched new Alstare Suzuki rider Max Neukirchner at the tail end of the field. Laconi set a 1min 34.0secs, an ill Neukirchner a 1min 35.5secs and Tamada a 1min 35.8secs.
Lap times should drop on Wednesday, when the official teams will be given development tyres by Pirelli, but not the satellite Sterilgarda outfit which will remain on 'standard' tyres. Hannspree Ten Kate Honda is the only factory WSBK outfit not present at the test.
In the World Supersport test, another home rider - Yamaha WSSP's Broc Parkes - set the pace after waiting for conditions to improve near the end of the day.
