Max Biaggi and Aprilia claimed their best WSBK finish since the Italian's double podium at round two in Qatar, with fourth place in race two at Miller Motorsports Park on Sunday.

Biaggi, who had been sixth in race one, claimed the position despite lining up a lowly 16th on the grid after an accident in Superpole.

"In race one I made two beautiful starts and fought to take as many points as possible. Starting from 16th place I reached eighth position on the first lap. However after the re-start, because of the fall of Muggeridge, I had to accept sixth position," Biaggi wrote on his official website.

"The second race was quite good. I had an exciting fight with Rea and Haslam, but unfortunately on the last lap I was held up by Haslam's fall and therefore brought my RSV4 within one place of the podium.

"I am satisfied enough with my bike and I thank the team once again for the great development job."

Biaggi now believes he has identified the next area for improvement with the brand-new RSV4.

"I think I have understood the road to resolve our bigger problem; the bike is not stable in entry and when I am riding through corners," he said. "Now we will work with our technicians to find some solutions as soon as possible, even if up to July we cannot make tests.

"My objective is to improve a lot to give a great result in front of my fans in Misano."

Biaggi is now fifth in the championship standings after seven of 14 rounds, just seven points behind Ten Kate Honda's Jonathan Rea. Aprilia is presently fourth out of seven in the manufacturers' championship.