Shinya Nakano and Regis Laconi led the way during testing at Phillip Island on Tuesday, with both riders coming away with similar lap times.
Although activity on the circuit was limited to Aprilia, DFX Ducati, Stiggy Honda and Kawasaki, as well as a handful of Supersport competitors, both Nakano and Laconi set a fine pace to be just over half a second adrift of Troy Bayliss' lap record.
Their laps of 1min 33.1secs proved six tenths quicker than Nakano's team-mate Max Biaggi, although the Italian's day was cut short by an accident at the Honda Curve, one that left him unhurt but the RSV-4 damaged.
Elsewhere, Leon Haslam was just behind on 1min 34.1secs. EDIT: Roberto Rolfo did lap at Phillip Island, producing an unofficial best lap time of 1min 34.0secs.
Kawasaki, meanwhile, endured a difficult session with Makoto Tamada and Broc Parkes producing times of 1min 34.9secs and 1min 35.1secs as they continue to dial in the ZX10-R K9.
In the Supersport category, Anthony West was quickest on home ground with Stiggy Honda, half a second quicker than team-mate Gianluca Vizziello. Mark Aitchison and Matthieu Lagrive were marginally adrift Vizziello in third and fourth aboard their Althea Hondas.Phillip Island World Superbike unofficial testing times – Tuesday
1. Shinya Nakano
JPN Aprilia RSV-4 1min 33.1secs
2. Regis Laconi
FRA DFX Corse Ducati 1098RS 1min 33.1secs
3. Max Biaggi
ITA Aprilia RSV-4 1min 33.7secs
4. Roberto Rolfo
ITA Stiggy Honda CBR1000RR 1mmin 34.0secs
5. Leon Haslam
GBR Stiggy Honda CBR1000RR 1min 34.1secs
6. Makoto Tamada
JPN Kawasaki SRT ZX10-R 1min 34.9secs
7. Broc Parkes
AUS Kawasaki SRT ZX10-R 1min 35.1secsPhillip Island World Supersport unofficial testing times – Tuesday
1. Anthony West
AUS Stiggy Honda CBR600RR 1min 36.2secs
2. Gianluca Vizziello
ITA Stiggy Honda CBR600RR 1min 36.7secs
3. Mark Aitchison
AUS Althea Honda CBR600RR 1min 36.7secs
4. Matthieu Lagrive
FRA Althea Honda CBR600RR 1min 36.9secs
Testing continues tomorrow