Max Biaggi has shown the Aprilia RSV4 to be competitive ahead of the 2009 FIM Superbike World Championship by topping the test times in Australia.
Ahead of the first race of the season at Phillip Island on March 1 the Italian was quickest despite suffering a fall.
Biaggi was also close to the the quickest race lap at the circuit set by Troy Bayliss last season on his way to the world title on Ducati.
Biaggi said: "We completed every test possible with all the material available, in every condition and we know exactly the problems we are facing.
"Now is the time to make some important modifications, obviously not for the next race because that's impossible, but shortly after."
Biaggi's team-mate Shinya Nakano was also on the pace along with Regis Laconi who was able to resume testing on the privateer DFX Ducati 1098RS even after he fell and fractured a finger on his left hand.
Kawasaki's Broc Parkes set good laps on the Kawasaki ZX10R F09, no doubt helped by the attendance of nine engineers from the Japanese company's racing division.
Honda Stiggy duo Leon Haslam and Roberto Rolfo also showed good from and their team-mate Anthony West set the best time of the four FIM World Supersport Championship riders on duty.
The final test session at Phillip Island takes place on Saturday and Sunday, with factory teams from Ducati, BMW, Suzuki Alstare, Honda Ten Kate and Yamaha taking part.